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CF745

EPROM/ROM-Based 8-Bit CMOS Microcontroller Series

Microchip Technology 

4.2 Data Memory Organization

Data memory is composed of registers, or bytes of

RAM. Therefore, data memory for a device is specified

by its register file. The register file is divided into two

functional groups: special function registers and

general purpose registers.

The special function registers include the TMR0

register, the Program Counter (PC), the Status

Register, the I/O registers (ports), and the File Select

Register (FSR). In addition, special purpose registers

are used to control the I/O port configuration and

prescaler options.

The general purpose registers are used for data and

control information under command of the instructions.

For the PIC16C52, PIC16C54s, PIC16CR54s,

PIC16C56s and PIC16CR56s, the register file is

composed of 7 special function registers and 25

general purpose registers (Figure 4-5).

For the PIC16C55s, the register file is composed of 8

special function registers and 24 general purpose

registers.

For the PIC16C57s and PIC16CR57s, the register file

is composed of 8 special function registers, 24 general

purpose registers and up to 48 additional general

purpose registers that may be addressed using a

banking scheme (Figure 4-6).

For the PIC16C58s and PIC16CR58s, the register file

is composed of 7 special function registers, 25 general

purpose registers and up to 48 additional general

purpose registers that may be addressed using a

banking scheme (Figure 4-7).

4.2.1 GENERAL PURPOSE REGISTER FILE

The register file is accessed either directly or indirectly

through the file select register FSR (Section 4.7).

PIC16C5X

FIGURE 4-5:

PIC16C52, PIC16C54s,

PIC16CR54s, PIC16C55s,

PIC16C56s, PIC16CR56s

REGISTER FILE MAP

File Address

00h

01h

02h

03h

04h

05h

06h

07h

INDF(1)

TMR0

PCL

STATUS

FSR

PORTA

PORTB

PORTC(2)

0Fh

General

10h

Purpose

Registers

1Fh

Note 1: Not a physical register. See Section 4.7

2: PIC16C55s only, others are a general

purpose register.

© 1998 Microchip Technology Inc.

Preliminary

DS30453B-page 17

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