PIC16C661-20I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C661-20I/P

8-Bit EPROM Microcontrollers with Analog Comparators

Microchip Technology 

PIC16C64X & PIC16C66X

FIGURE 3-2: PIC16C661/662 BLOCK DIAGRAM

PIC16C661 has 2K x 14 Program Memory and 128 x 8 RAM

PIC16C662 has 4K x 14 Program Memory and 176 x 8 RAM

EPROM

Program

Memory

Program

Bus

14

Instruction reg

13

Program Counter

8 Level Stack

(13-bit)

RAM Bank

Select

Direct Addr 7

Data Bus

8

RAM

File

Registers

9

Addr MUX

Indirect

8 Addr

FSR reg

STATUS reg

Instruction

Decode &

Control

OSC1/CLKIN

OSC2/CLKOUT

Timing

Generation

Power-up

Timer

Oscillator

Start-up Timer

Power-on

Reset

Watchdog

Timer

Brown-out

Reset

Parity Error

Reset

3

MUX

ALU

W reg

MCLR VDD, VSS

Parallel

Slave

Port

RE0/RD

RE1/WR

RE2/CS

PORTE

Voltage

Reference

Comparator

-

+

-

+

Timer0

PORTA

RA0/AN0

RA1/AN1

RA2/AN2/VREF

RA3/AN3

RA4/T0CKI

PORTB

PORTC

PORTD

RA5

RB0/INT

RB1

RB2

RB3

RB4

RB5

RB6

RB7

RC0

RC1

RC2

RC3

RC4

RC5

RC6

RC7

RD0/PSP0

RD1/PSP1

RD2/PSP2

RD3/PSP3

RD4/PSP4

RD5/PSP5

RD6/PSP6

RD7/PSP7

© 1996 Microchip Technology Inc.

Preliminary

DS30559A-page 11

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