mikroprosesor tentang peta memori tanpa gambar

UJIAN TENGAH SEMESTERMIKROPROSESOR DAN ANTARMUKA

RANGKAIAN PROGRAM DAN APLIKASI SISTEM MINIMUM 8088 UNTUK APLIKASI KEYPAD, LCD, DOT MATRIKS DAN PIT

OLEH :YOFI SEPTRINO ASHAR

0910953100

DOSEN :Ir. DARWISON, MT

JURUSAN TEKNIK ELEKTROFAKULTAS TEKNIK

UNIVERSITAS ANDALAS2010

RANGKAIAN PROGRAM DAN APLIKASI SISTEM MINIMUM 8088 UNTUK APLIKASI KEYPAD, LCD, DOT DAN PIT

RAM0 (2KB)

Kosong

Kosong

RAM1 (8KB)

EPROM27128 ( 16 KB )

00000H

007FFH

FC000H

40300H

21FFFH

40303H

20000H

kosong

PPI 0

PPI 1

kosong

FFFFFH

60300H

60303H

kosong

PIC FC000H

FC000H

TUGAS

Rangkaian Program dan Aplikasi Sistem Minimum 8088 Untuk Aplikasi Keypad, LCD,

Dot Matriks Skala Besar Dan Sensor Jarak SHARP GP2D02yang terdiri dari :

p 8088

RAM-0 6116 ( 2 KB )

RAM-1 6264 ( 8 KB )

EPROM 27128 ( 16 KB )

PPI 8255 (2 buah)

PIC 8259 (1 buah)

Peta memori

Tabel Kebenaran untuk peta memori di atas adalah :

Tipe

memori

Alamat Ket

A19 – A16 A15 – A12 A11 – A8 A7 – A4 A3 – A0

RAM-0

6116

( 2 KB )

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Awal (00000H)

0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 Akhir (007FFH)

0 0 0 0 0 0 0 0 0 x x x x x x x x x x x Kapasitas (7FFH)

RAM-1

6264

( 8 KB )

0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Awal (20000H)

0 0 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 Akhir (21FFFH)

0 0 0 0 0 0 0 x x x x x x x x x x x x x Kapasitas (1FFFH)

PPI-0 0 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 Awal (40300H)

0 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 Akhir (40303H)

0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 x x Kapasitas (3H)

PP-1 0 1 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 Awal (60300H)

0 1 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 Akhir (60300H)

0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 x x Kapasitas (3H)

PIC 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Awal (80000H)

1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 Akhir (80001H)

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x Kapasitas (1H)

EPROM

27128

( 16 KB )

1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Awal (FC000H)

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Akhir (FFFFFH)

0 0 0 0 0 0 x x x x x x x x x x x x x x Kapasitas (3FFF)

Tabel dari pin – pin dekoder yang digunakan

Tipe memori Kapasitas Alamat Ket

A19 A18 A17

memori

RAM-0 6116 2 KB 0 0 0 Y0

RAM-1 6264 8 KB 0 0 1 Y1

PPI-0 0 1 0 Y2

PPI-1 0 1 1 Y3

PIC 1 0 0 Y4

EPROM 27128 16 KB 1 1 1 Y7

Menentukan alamat jump reset

ROM yang digunakan adalah 16 Kb

FFFFF (µP 8088 mampu mengakses 1 Mb)

3FFF (Kapasitas ROM)

FC000 (awal EPROM)

FFFF0 (tempat jump reset pada 8088)

FC000 (awal EPROM)

3FF0 (lokasi jump reset pada EPROM 16 Kb)

Misal origin yang diinginkan adalah 200H sehingga perhitungannya adalah.

FC000 : FC00 : 0000 (org 0H)

200

FBE00 : FBE0 : 0200 (org 200H)

Program listing

; DIGUNAKAN UNTUK MENAMPILKAN DATA DARI KEYPAD KE DISPLAY LCD

; DATA LCD : PA; E : PB5; RS : PB6

; data keypad; PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0; OE X X X B A D C

CODE_SEG SEGMEN ; code_seg sebagai segmen ASSUME CS:CODE_SEG,DS:C0DE_SEG,SS:CODE_SEG ORG 100H ; program ditulis mulai origin 100h

start: jmp mulai ; Awal program pada Org 100h

pa2 equ 304hpb2 equ 305hpc2 equ 306hcw2 equ 307h

DISPCLR EQU 00000001BFUNCSET EQU 00111000BENTRMOD EQU 00000110BDISPON EQU 00001100B

awal db ?data db ?dat_key db ?ratusan db ?puluhan db ?satuan db ?akhir db ?

mulai:Mov AX, CS ; Menyamakan data segmen dengan code

; segmenMov DS, AXXor AX, AX ; Mengenolkan ES dan SS supaya

; mengarah pada alamat RAM Minimum SistemMov ES, AX ; ES = 0 -> segmen address RAMMov SS, AX ; SS = 0 -> segmen address RAm

Lea SI, Awal ; menyalin data dari ROM ke RAMLea CX, Akhir ; CX diisi offset AkhirDtMov DI, SI ; DI = [SI]Sub Cx, SI ; CX = [cx]-[SI] = AkhirDt-AwalDt

; = jumlah data

Cld ; membuat direction flag = 0 -> SI&DI; incremented

Rep Movsb ; ulang {ES:[DI]<-DS:[SI]} sebanyak [CX]

Mov SP,2000h ; SP = 2000h = 8Kb->nilai maksimum RAM

Xor AX,AX ; menolkan data segmen agar menunjuk; alamat data di RAM yang telah; disalinkan dari ROm pada sistem min

Mov DS,AX ; DS = 0 -> segmen address RAM

mov al,10000000bmov dx,cwout dx,al

call init_lcd

putar:mov dx,pc2 ; status tombol ditekan PC7 = 0in al,dxand al,128cmp al,128je putar

in al,dxand al,00001111bcall konv_keypad_to_binmov data_key,al

mov data,80hcall controlout

mov al,data_keymov ah,0add ax,30hmov data,alcall dataout

tunggu:mov dx,pc2 ; status tombol dilepas PC7 = 1in al,dxand al,128cmp al,0je tunggu

jmp putar

; PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

; OE X X X B A D C KEY; 0 1 0 0 1; 1 0 0 0 2; 1 1 0 0 3; 0 0 0 1 4; 0 1 0 1 5; 1 0 0 1 6; 1 1 0 1 7; 0 0 1 0 8; 0 1 1 0 9; 1 0 1 0 0; 1 1 1 0 *; 0 0 1 1 #

konv_keypad_to_bin proc nearcmp al,4jne klmov al,1ret

k1:cmp al,8jne k2mov al,2ret





k6:cmp al,9jne k7mov al,6

retk7:

cmp al,13jne k8mov al,7ret



k0:cmp al,10jne kbmov al,0ret

kb:cmp al,14jne kpmov al,14ret

kp:cmp al,3jne metumov al,3ret

metu:ret

konv_keypad_to_bin endp

;----------------------------; PEMESANAN TEMPAT;----------------------------; E : PB0 : 0 1 0; RS : PB1 : 0controlout proc near

mov dx,pb2mov al,0out dx,alcall delay_lcd

mov dx,pb2mov al,1

out dx,alcall delay_lcd

mov dx,pa2mov al,dataout dx,alcall delay_lcd

mov dx,pb2mov al,0out dx,alcall delay_lcdret

controlout endp

;----------------------------; PENEMPATAN DATA;----------------------------; E : PB0 : 0 1 0; RS : PB1 : 1dataout proc near



mov dx,pa2mov al,dataout dx,alcall delay_lcd

mov dx,pb2mov al,2out dx,alcall delay_lcdret

dataout endp

;-----------------------------; INISIALISASI LCD;-----------------------------init_lcd proc near

mov data,DISPCLR

call controloutcall delay_lcd

mov data,FUNCSETcall controloutcall delay_lcd

mov data,ENTRMODcall controloutcall delay_lcd

mov data,DISPONcall controloutcall delay_lcdret

init_lcd endp

delay_lcd proc near ; procedure delaypush cx ; simpan cxmov cx,01fffh ; isi cx dengan lama delayloop $ ; loopng sampai cx=0pop cx ; keluarkan cxret ; kembali ke program utama

delay_lcd endp ; akhir procedure delay

delay proc near ; procedure delaypush cx ; simpan cxmov cx,0ffffh ; isi cx dengan lama delayloop $ ; loopng sampai cx=0pop cx ; keluarkan cxret ; kembali ke program utama

delay endp ; akhir procedure delay

ORG 20F0H ; alamat yang dituju setelah resetDB 0EAH ; JMP reset keDW 0100H ; alamat offset 0100hDW 0FDF0H ; alamat segmen 0FBFH

CODE_SEG ENDS ; batas segmen code_seg END START ; akhir program

;---------------------------------------------------; APLIKASI PIC (PROGRAMMABLE INTERRUPT CONTROLLER);---------------------------------------------------CODE_SEG SEGMENT ; code_seg sebagai segment

ASSUME CS:CODE_SEG,DS:CODE_SEG,SS:CODE_SEG ORG 100H ; program ditulis mulai origin 100h

start: jmp mulai ; Awal program pada Org 0100H

porta equ 00h ; Menentukan alamat port A,B,Cportb equ 01h ; dan ctrlword sesuai denganportc equ 02h ; hardwarenyacw equ 03hpica equ 04hpicb equ 05hicw1 equ 00010011b ;edge triggered, single, ICW4icw2 equ 00001000bicw4 equ 00000001bocw1 equ 11111100b ; ir0 dan ir1 enable

; ir2-ir7 disable

awal db ?data1 db ?data2 db ?akhir db ?

mulai: Mov AX, CS ; Menyamakan data segment dengan code segment Mov DS, AX Xor AX, AX ; Mengenolkan ES dan SS supaya ; mengarah pada alamat RAM Minimum Sistem Mov ES, AX ; ES = 0 -> segment address RAM Mov SS, AX ; SS = 0 -> segment address RAM

Lea SI, Awal ; menyalin data dari ROM ke RAM Lea CX, Akhir ; CX diisi offset AkhirDt Mov DI, SI ; DI = [SI] Sub CX, SI ; CX = [CX]-[SI] = AkhirDt-AwalDt

; = jumlah data Cld ; Membuat Direction flag = 0 -> SI&DI incremented Rep Movsb ; ulang { ES:[DI] <-- DS:[SI] } sebanyak [CX]

Mov SP,2000h ; SP = 2000h = 8Kb -> nilai maksimum RAM

Xor AX,AX ; Menolkan data segment agar menunjuk alamat data di RAM yang telah disalinkan

; dari ROM pada sistem minimum Mov DS,AX ; DS = 0 -> segment address RAM

lea bx,animasi1mov es:[20h],bxmov es:[22h],cs ; ir0

lea bx,animasi2mov es:[24h],bxmov es:[26h],cs ; ir1

mov al,icw1mov dx,picaout dx,al ; ICW1 dikeluarkan

mov al,icw2mov dx,picbout dx,al ; ICW2 dikeluarkan

mov al,icw4mov dx,picbout dx,al ; ICW4 dikeluarkan

mov al,ocw1mov dx,picbout dx,al ; OCW1 dikeluarkan

mov al,80h ; inisialisasi ppi mov dx,cw out dx,al ; semua port output

call offsti

lagi:call kedipjmp lagi

;------------------------; prosedur untuk pooling;------------------------kedip proc near

call offcall delay

call oncall delayret

kedip endp

;--------------------; prosedur untuk ir0;--------------------animasi1 proc near

pushf

push axpush cxpush dxcall offmov data1,1mov data2,128mov cx,8

putarA_C:mov dx,portamov al,data1not alout dx,alnot alshl al,1mov data1,al

mov dx,portcmov al,data2not alout dx,alnot alshr al,1mov data2,alcall delayloop putarA_Ccall off

mov data1,00000001bmov data2,10000000bmov cx,4

putarB:mov dx,portbmov al,data1or al,data2not alout dx,alcall delay

mov al,data1shl al,1mov data1,al

mov al,data2shr al,1mov data2,al

loop putarBcall off

mov al,00100000b ;ocw2 non specific EOImov dx,picaout dx,alpop dxpop cxpop axpopfiret

animasi1 endp

;--------------------; prosedur untuk ir1;--------------------animasi2 proc near

pushfpush axpush cxpush dxcall offmov data1,00010000bmov data2,00001000bmov cx,4

putarB2:mov dx,portbmov al,data1or al,data2not alout dx,alcall delay

mov al,data1shr al,1mov data1,al

mov al,data2shl al,1mov data2,al

loop putarB2call off

mov data1,128mov data2,1mov cx,8

putarA_C2:mov dx,portamov al,data1not al

out dx,alnot alshr al,1mov data1,al

mov dx,portcmov al,data2not alout dx,alnot alshl al,1mov data2,alcall delayloop putarA_C2call offmov al,00100000b ; ocw2 non specific EOImov dx,picaout dx,al ; ocw2 dikeluarkan dengan A0 = 0pop dxpop cxpop axpopfiret

animasi2 endp

off proc nearmov al,255mov dx,portaout dx,al

mov dx,portbmov al,255out dx,al

mov dx,portcmov al,255out dx,alret

off endp

on proc nearmov al,0mov dx,portaout dx,al

mov dx,portbmov al,0out dx,al

mov dx,portcmov al,0out dx,alret

on endp

delay proc near ; Procedure delaypush cx

mov cx,0ffffh ; isi cx dengan lama delay loop $ ; loopng sampai cx=0 pop cx ; keluarkan cx ret ; kembali ke program utamadelay endp ; akhir procedure delay

; ROM 2764 ORG 20F0H ; alamat yang dituju setelah reset DB 0EAH ; JMP reset ke DW 0100H ; alamat offset 0100h DW 0FDF0H ; alamat segmen 0FDFh

CODE_SEG ENDS ; batas segment code_seg END START ; akhir program

;-------------------------------------; Scanning Keypad Heksa;-------------------------------------PORTA EQU 300hPORTB EQU 301hPORTC EQU 302hCWORD EQU 303h

INIT EQU 99h ; A input mode 0; B input mode 0; C input mode 0

jmp main

Table db 'A1470258B369CDEF'

main:mov al,INIT ; initialize PPImov dx,CWORDout dx,al ; send to Control Word

Again:xor bx,bx ; zero table indexmov ah,11110111b ; set pattern for outputmov cx,4 ; loop 4 times

ColScan:mov dx,PORTBmov al,ah ; output patternout dx,al

mov dx,PORTAmov al,dx ; read key statusnot aland al,00001111b ; mask it

jz NextCol ; zero means no key pressedpush cxmov cx,4 ; loop 4 times

RowScan:shr al,1 ; shift data into carryjz Gotlt ; zero means it is the datainc bx ; else continuekoop RowScanpop cx ; recover okd counter

NextCol:add bx,4 ; next coulomn table entryshr ah,1 ; geser pola ke kolom lain

loop ColScan ; next coulomn

NoKey:jmp ReadKey ; no key pressed...

Gotlt:pop cx ; purge stackmov cx,1000

1: loop1 ; delay to debouncecall printmov cx,0ffffh ; wait for type matic

Wait:mov dx,PORTAmov al,dx ; wait for key upnot aland al,00001111bloopnz Wait ; still down

or cx,cx ; cx = means time outjz Print ; if time out then print

; character

jmp ReadKey ; else read key from PC

Print:call Printmov cx,0fffh ; typematic ratejmp Wait ; wait again

ReadKey:mov ah,1int 16h ; is any key pressed in PCjz Again ; no, lets scan again

mov ah,0 ; yes, then flush itint 16hint 20h ; back to DOS

; this routine will print character vai BIOS call; input : AK - character to print; output : None; All register not effectedPrint PROC

push axmov al,Table[bx]mov al,0Eh ; BIOS writettyint 10hpop axret

Print ENDP

;-----------------------------------------------------------------; PROGRAM DIGUNAKAN UNTUK DISPLAY DOT MATRIK DARI KANAN KE KIRI;-----------------------------------------------------------------

CODE_SEG SEGMENT ; code_seg sebagai segment ASSUME CS:CODE_SEG,DS:CODE_SEG,SS:CODE_SEG,ES:CODE_SEG ORG 100H ; program ditulis mulai origin 100h


PA equ 00h ; Menentukan alamat port A,B,CPB equ 01h ; dan ctrlword sesuai denganPC equ 02h ; hardwarenyacw equ 03h

awal db ?VAR1 DB ?VAR2 DW ?

DATA DB 7EH,09H,09H,09H,7EH,00H ;ADB 7FH,49H,49H,49H,36H,00H ;BDB 3EH,41H,41H,41H,41H,00H ;CDB 7FH,41H,41H,41H,3EH,00H ;DDB 7FH,49H,49H,49H,49H,00H ;EDB 7FH,09H,09H,09H,09H,00H ;FDB 3EH,41H,49H,49H,39H,00H ;GDB 7FH,08H,08H,08H,7FH,00H ;HDB 7FH,00H ;IDB 00H,30H,41H,41H,3FH,00H ;JDB 7FH,08H,14H,22H,41H,00H ;KDB 7FH,40H,40H,40H,40H,00H ;LDB 7FH,02H,04H,02H,7FH,00H ;MDB 7FH,02H,04H,08H,7FH,00H ;NDB 3EH,41H,41H,41H,3EH,00H ;ODB 7FH,09H,09H,09H,06H,00H ;PDB 3EH,41H,49H,51H,3EH,00H ;QDB 7FH,09H,19H,29H,46H,00H ;RDB 26H,49H,49H,49H,32H,00H ;SDB 01H,41H,7FH,41H,01H,00H ;TDB 3FH,40H,40H,40H,3FH,00H ;U

DB 00H,00H,00H,00H,00H,00H DB 00H,00H,00H,00H,00H,00H

DB 00H,00H,00H,00H,00H,00HDB 00H,00H,00H,00H,00H,00HDB 00H,00H,00H,00H,00H,00H

akhir db ?

mulai: Mov AX, CS ; Menyamakan data segment dengan code segment Mov DS, AX Xor AX, AX ; Mengenolkan ES dan SS supaya ; mengarah pada alamat RAM Minimum Sistem Mov ES, AX ; ES = 0 -> segment address RAM Mov SS, AX ; SS = 0 -> segment address RAM

Lea SI, Awal ; menyalin data dari ROM ke RAM Lea CX, Akhir ; CX diisi offset AkhirDt Mov DI, SI ; DI = [SI] Sub CX, SI ; CX = [CX]-[SI] = AkhirDt-AwalDt ; = jumlah data Cld ; Membuat Direction flag = 0 -> SI&DI incremented Rep Movsb ; ulang { ES:[DI] <-- DS:[SI] } sebanyak [CX]

Mov SP,2000h ; SP = 2000h = 8Kb -> nilai maksimum RAM

Xor AX,AX ; Menolkan data segment agar menunjuk alamat data di RAM yang telah disalinkan ; dari ROM pada sistem minimum Mov DS,AX ; DS = 0 -> segment address RAM

mov al,80h ; init ppi mov dx,cw ; pada 80H MODE = 0 out dx,al ; port AC = output, B = input

MANEH:CALL SIJIJMP MANEH

SIJI PROC NEARMOV CX,01H

PUTAR: PUSH CXLEA BX,DATAMOV VAR1,37HMOV VAR2,00HDEC VAR1

LOP1: MOV SI,VAR2MOV AH,37H

LOP: DEC AHDEC SIMOV DX,PAMOV AL,BYTE PTR[BX+SI]OUT DX,ALCALL OUTUCALL DELAY

LOP2: CMP AH,VAR1JNE LOP

MOV SI,VAR2INC VAR2

MOV AH,VAR1DEC VAR1CMP VAR1,00HJNE LOP1JMP LOP13

PUTAR1: JMP PUTAR

LOP13: MOV VAR2,00HLOP4: MOV SI,VAR2

MOV VAR1,00HLOP3: MOV DX,PA

MOV AL,BYTE PTR[BX+SI]

OUT DX,ALCALL OUTICALL DELAY

INC VAR1CMP SI,90HJE LOP5INC SI

LOP5: CMP VAR1,37HJNE LOP3MOV SI,VAR2INC VAR2CMP VAR2,90HJNE LOP4CALL DELAYMOV DX,PAMOV AL,00HOUT DX,ALCALL DELAYPOP CXLOOP PUTAR1RET

SIJI ENDP

OUTI PROC NEARMOV DX,PBMOV AH,VAR1MOV AL,AHOUT DX,ALRET

OUTI ENDP

OUTU PROC NEARMOV DX,PBMOV AL,AHOUT DX,ALRET

OUTU ENDP

DELAY PROC NEARMOV CX,10 ; 1ffh

LAGI: PUSH CXMOV CX,10 ; 18hLOOP $POP CXLOOP LAGIRET

DELAY ENDP


CODE_SEG ENDS ; batas segment code_seg END start ; akhir program

;Program passwordSTART: JMP MULAIKATA DB 'MASUKAN PASSWORD ANDA DISINI : $'PASSWORD DB '06175046'PASSWORD1DB 4,?,4 DUP(?)KATA1 DB 13,10, 'PASSWORD ANDA SALAH ULANGI

LAGI !',13,10,13,10,'$'KATA2 DB 13,10, 'PASSWORD ANDA BENAR !',13,10,13,10,'$'MULAI: MOV AH,09H

MOV DX,OFFSET KATAINT 21H ;MENCETAK KATAMOV AH,0AHMOV DX,OFFSET PASSWORD1 ;AMBIL PASSWORDINT 21HPUSH DSPOP ES ;ES=DSMOV DI,OFFSET PASSWORDMOV SI,OFFSET PASSWORD1 + 2MOV CX,03HCLD ;PROSES KE BAWAH

ULANG: CMPSB ;PROSES CMPSBJC SALAH ;JIKA TIDAK SAMA KE SALAHLOOP ULANGMOV AH,09HMOV DX,OFFSET KATA2INT 21H ;CETAK KATAMOV AH,4CHINT 21H ;AKHIR PROGRAM

SALAH: MOV AH,09HMOV DX,OFFSET KATA1INT 21H ;CETAK KATAJMP MULAI ;LONCAT KE MULAI

; PROG13.ASM APLIKASI PIT (PROGRAMMABLE INTERVAL TIMER); POSISI GATE 0 = 0; GATE 1 = 0

; GATE 2 = 0; CLK2INT; OUTPUT CLK PADA TERMINAL BIRU OUT2

;----------------------------------------; control word PIT;----------------------------------------; D7 D6 D5 D4 D3 D2 D1 D0; SC1 SC0 RL1 RL0 M2 M1 M0 BCD

;---------; SC1 SC0;---------; 0 0 counter 0; 0 1 counter 1; 1 0 counter 2; 1 1 illegal

;---------; RL1 RL0;---------; 0 0 counter latching operation; 0 1 read/load hanya MSB; 1 0 read/load hanya LSB; 1 1 read/load LSB kemudian MSB

;----------; M2 M1 M0;----------; 0 0 0 mode 0intterupt on terminal count; 0 0 1 mode 1hardware retriggerable one shot; 0 1 0 mode 2time intterupt; 0 1 1 mode 3square wave generator; 1 0 0 mode 4software trigger strobe; 1 0 1 mode 5hardware trigger strobe

;-----; BCD;-----; 0 binary counter 16 bit; 1 BCD counter

CODE_SEG SEGMENT ; code_seg sebagai segment ASSUME CS:CODE_SEG,DS:CODE_SEG,SS:CODE_SEG ORG 100H ; program ditulis mulai origin 100h


pit0 equ 08h ; timer 0pit1 equ 09h ; timer 1pit2 equ 0ah ; timer 2pitcw equ 0bh ; control word

; clock input di clk2 = 2 MHz; untuk menjadikan out 2 = 1 KHz, maka dibagi 2000 = 20H 00H

mulai:mov al,10110111b ; 1 kHz square wave, LSB then MSB, BCDmov dx,pitcwout dx,al

; faktor pembagi 2000h = 20h 00hmov dx,pit2 ; counter 2mov al,00hout dx,al ; LSB of count

mov al,20hout dx,al ; MSB of count

lagi:jmp lagi


CODE_SEG ENDS ; batas segment code_seg END START ; akhir program

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