3_admd2

1ST7 MICROCONTROLLER TRAININGST7 MICROCONTROLLER TRAINING

1. INTRODUCTION2. CORE 3. ADRESSING MODES4. PERIPHERALS5. ST7 SOFTWARE TOOLS6. ST7 HARDWARE TOOLS7. STVD7

2SOFTWARE DESCRIPTIONSource Program Format

SOFTWARE DESCRIPTIONSource Program Format

z A program is made up of lines. Each assembler line consists of up to 4 fields The label field: it is an identifying label The operation field: it contains a word which specifies the action to be

performed by the assembly process The operand field: it is constitued of quantity (number or register) on

which the operation is performed The comment field: for any comment concerning the line

substract sub A, #$22 ; substract $22 to the value hold by A

LabelOperation

OperandComment

3INHERENTINHERENT

z The OP code fully specify all required information for the cputo process the operation (The inherent instructions are single byte long).

z Example

RCF - Reset Carry Flag ; RSP - Reset Stack Pointer HALT ; WFI - Low consumption modes TRAP - Enter software interrupt RET - Return ; IRET -Interrupt Return SIM - Set Interrupt Mask ; RIM - Reset Interrupt Mask PUSH A ; POP Y - Stack operation

4IMMEDIATE ADDRESSING MODEIMMEDIATE ADDRESSING MODE

BCP A, #$FF XOR A, #%01001110 LD X, #255

z Example

LD A, #$55

Before Completion After Completion

A = Previous value A = $55

5SHORT DIRECT ADDRESSING MODESHORT DIRECT ADDRESSING MODE

z ADDRESSABLE SPACE: 00 to FF INC variable NEG variable SRA variable

z Example

If label is an 8 bit symbol defined as $86

INC label


$086 5A $086 5B

6ADD A, LABEL


$F1D6 0A

A = $C1 A = $CB

LONG DIRECT ADDRESSING MODELONG DIRECT ADDRESSING MODE

z ADDRESSABLE SPACE: 0000 to FFFF CP Y, VARIABLE SBC A, VARIABLE

z Example

If label is an 16 bit symbol defined as $F1D6

7NO OFFSET INDEXED ADDRESSING MODENO OFFSET INDEXED ADDRESSING MODE

z ADDRESSABLE SPACE: 00 to FF CPL (X) DEC (Y) OR A, (X)

z Example

CPL (X)


$D4 0A

X = $D4

$D4 F5

8RRC (label, X)

Before Completion After CompletionX = 03 and C=1

$90 0A$91$92$93

1EF6A8

C=0

$90 0A$91$92$93

1EF6D4

SHORT INDEXED ADDRESSING MODESHORT INDEXED ADDRESSING MODE

z ADDRESSABLE SPACE : 000 to 1FE RRC (variable, X) SWAP (variable, Y)

z Example


9LD X, (LABEL, X)

Before CompletionX = 02

$2E6D 0A$2E6E$2E6F$2E70

1E2FA8

After CompletionX = $2F

LONG INDEXED ADDRESSING MODELONG INDEXED ADDRESSING MODE

z ADDRESSABLE SPACE: 0000 to FFFF ADD A, (variable, Y) XOR A, (variable, X)

z Example

If label is an 16 bit symbol defined as $2E6D

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SHORT INDIRECT ADDRESSING MODESHORT INDIRECT ADDRESSING MODE

z ADDRESSABLE SPACE: 00 to FF TNZ [variable] CLR [variable]

z Example

If label is an 8 bit symbol defined as $4BBefore Completion After Completion

SWAP [label]$20

$4B 20

D4 $20

$4B 20

4D

11

LD A, [label.w]


$40

$42E5 11

42E5$41 A = $11

LONG INDIRECT ADDRESSING MODELONG INDIRECT ADDRESSING MODE

z ADDRESSABLE SPACE: 0000 to FFFF ADC A, [variable.w] BCP A, [variable.w]

z Example


12

CLR ([label], X)

Before Completion After CompletionX = 04

$0FE 0A$0FF$100$101

1EF6A8B3$102

FE$0C8

$0FE 0A$0FF$100$101

1EF6A800$102

FE$0C8

SHORT INDIRECT INDEXEDSHORT INDIRECT INDEXED

z ADDRESSABLE SPACE: 000 to 1FE RLC ([variable], Y) LD X, ([variable], X)

z Example If label is an 8 bit symbol defined as $C8

13

LD A, ([label.w],X,)


A = $84

X = 01$40

$42E5 11

42E5$41

84

LONG INDIRECT INDEXEDLONG INDIRECT INDEXED

z ADDRESSABLE SPACE : 0000 to FFFF SUB A, ([variable.w], X) AND A, ([variable.w], Y)

z Example If label is an 8 bit symbol defined as $40

14

RELATIVE ADDRESSING MODERELATIVE ADDRESSING MODE

z DIRECT ADDRESSABLE SPACE: PC-128 to PC+127 JRUGE label CALLR label

z INDIRECT ADDRESSABLE SPACE: PC-128 to PC+127 JRNC [label] JRH [label]

JRMI [label]

.PC + 40PC

.label 40

JRMI label

.label

PC

15

BIT MANIPULATIONBIT MANIPULATION

z DIRECT ADDRESSABLE SPACE: 00 to FF

z INDIRECT ADDRESSABLE SPACE: 00 to FF

BRES [variable], #7

variable = $86

$86$86

0 01 0 0 0001 01 0 0 000

BSET variable, #2variable variable

1 01 0 0 0011 01 0 0 000

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RELATIVE JUMP ON BIT TESTRELATIVE JUMP ON BIT TEST

z DIRECT ADDRESSABLE SPACE: 00 to FF

z INDIRECT ADDRESSABLE SPACE: 00 to FF

variable = $4B

BTJF [variable], #7, label$20

$4B 20

D4

Relative jump to label in range PC-128 to PC+127

Execute next instruction

variable = $85

BTJT variable, #3, label$85 F8

17

SHIFT AND ROTATE INSTRUCTIONSSHIFT AND ROTATE INSTRUCTIONS

z RLC

z RRC

z SLA and SLL

z SRA

z SRL

7 6 5 4 3 2 1 0C

0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

C

C

C

C

0

18

ADDRESSING MODES SummaryADDRESSING MODES Summary

A D D R E S S IN G M O D E S Y N T A X E X A M P L E S A D D R E S S R A N G E Inherent R C F ; M U L X ,A ; S W A P A ; C LR X ; W FI N ot applicable Im m ediate B C P A , #$0FF ; X O R A , #% 01001110 N ot applicable S hort D irect IN C variable ; N EG variable ; S R A variable 00...FF Long D irect C P Y, V A R IA B LE ; S B C A , V A R IA B LE 0000...FFFF N o offset Indexed C P L (X ) ; D EC (Y) ; O R A , (X ) 00...FF S hort Indexed R R C (variable, X ) ; S W A P (variable, Y) 000...1FE Long Indexed A D D A , (V A R IA B LE, Y) 0000...FFFF S hort Indirect TN Z [variable] 00...FF Long Indirect A D C A , [variable.w ] 0000...FFFF S hort Indirect Indexed R LC ([variable], Y) ; LD X , ([variable], X ) 000...1FE Long Indirect Indexed S U B A , ([variable.w ], X ) 0000...FFFF R elative D irect JR U G E label ; C A LLR label P C -128/+127 R elative Indirect JR N C [label] ; JR H [label] P C -128/+128 B it D irect B R ES variable, #7 00...FF B it Indirect B S ET [variable], #7 00...FF R elative B it D irect B TJT variable, #3, label 00...FFR elative B it Indirect B TJF [variable], #7, label 00...FF

19

EXERCICES ON ADDRESSING MODESEXERCICES ON ADDRESSING MODES

z What is the content of the registers X,Y and Aafter the execution of the 3 instructions ?

X = ?Y = ?A = ?

X = 03 and Y = 04

LD X,(Label,X)LD Y,([Label],Y)LD A,([Label2.w],Y)

Before Completion

After Completion

M em o ry A d d ress M em o ry C o n ten tL ab el2: $009F O O

$00A 0 A 6$00A 1 53

L ab el: $00A 2 A 0$00A 3 B 8$00A 4 O 1$00A 5 O 4$00A 6 D 3$00A 7 61

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