Presented by

Jabez Winston C

Jagdeesh S

Shibin B

About Microchip

Microchip Technology is an American manufacturer of microcontroller, memory and analog semiconductors.

HQ - Chandler, Arizona

Wafer Fabs - Tempe, Arizona and Gresham, Oregon

Assembly/Test facilities - Chachoengsao, Thailand

Competitors to Microchip

Analog Devices

Atmel

Freescale

Infineon

Maxim Integrated Products

NXP Semiconductors

Renesas Electronics

STMicroelectronics

Texas Instruments

PIC architecture RISC instruction set

PIC – Programmable Interface Controller ??

Peripheral Interface Controller ??

Programmable Interface Controller ??

Microchip Microcontroller variants 8-bit MCUs

PIC10, PIC12 - 12 bit wide code memory/instruction

PIC16 - 14 bit wide code memory/instruction

PIC18 - 8 bit wide code memory / 16 bit instruction

16-bit MCUs –

PIC24 -12 bit wide code memory / 24 bit instructions

dsPIC - 12 bit wide code memory / 24 bit instructions

32-bit MCUs - PIC32MX, PIC32MZ

32 bit instruction set

16 bit instruction set for compact code

ProblemDesign a circuit to turn on LED

when voltage is less than 3 V or greater than 4 V

ADC(Analog to Digital Converter)

ADC converts physical quanity(usually voltage) to a digital number.

(for n-bit ADC)

n-bit ADC can produce value in the range 0 to 2n

Analog Digital

input output

Range: Vref- to Vref+ Range: 0 to 2n

ADC

For example , a 8 bit ADC has +ve voltage reference of 5 V and –ve voltage reference of 0V. What is ADC value for 2.5 V ?

PIC12F683

PIC12F683 has 10 bit Successive Approximation ADC.

Default reference voltages are

For 3 V , ADC value

For 4 V , ADC value

PIC 12F683 registers ANSEL – Configure pins as digital/analog and

A/D conversion clock select

ADCON0 – Channel , Reference voltage select,etc.,

ADRESH

ADRESL ADC Result registers

ANSEL

ADCON0

ADRESH & ADRESL Registers

Left justified result

Right justified result