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PIC16C55XA

EPROM-Based 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16C55X(A)

FIGURE 3-1: BLOCK DIAGRAM

Device

PIC16C554

PIC16C554A

PIC16C556A

PIC16C558

PIC16C558A

Program

Memory

512 x 14

512 x 14

1K x 14

2K x 14

2K x 14

Data Memory

(RAM)

80 x 8

80 x 8

80 x 8

128 x 8

128 x 8

EPROM

Program

Memory

512 x 14

to

2K x 14

Program

Bus

14

Instruction reg

13

Program Counter

Data Bus

8

8 Level Stack

(13-bit)

RAM

File

Registers

80 x 8 to

128 x 8

RAM Addr(1)

8

Addr MUX

Direct Addr 7

Indirect

8 Addr

FSR reg

STATUS reg

8

Instruction

Decode &

Control

OSC1/CLKIN

OSC2/CLKOUT

Timing

Generation

Power-up

Timer

Oscillator

Start-up Timer

Power-on

Reset

Watchdog

Timer

3

MUX

ALU

8

W reg

MCLR VDD, VSS

Timer0

PORTA

PORTB

RA0

RA1

RA2

RA3

RA4/T0CKI

RB0/INT

RB7:RB1

Note 1: Higher order bits are from the status register.

DS40143B-page 10

Preliminary

© 1997 Microchip Technology Inc.

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