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PIC16C5X

DS30453D-page 26

Preliminary

2002 Microchip Technology Inc.

6.2

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 reg-

ister, 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 PIC16C54, PIC16CR54, PIC16C56 and

PIC16CR56, the register file is composed of 7 Special

Function Registers and 25 General Purpose Registers

(Figure 6-4).

For the PIC16C55, the register file is composed of 8

Special Function Registers and 24 General Purpose

Registers.

For the PIC16C57 and PIC16CR57, 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 6-5).

For the PIC16C58 and PIC16CR58, 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 6-6).

6.2.1

GENERAL PURPOSE REGISTER

FILE

The register file is accessed either directly or indirectly

through the File Select Register (FSR). The FSR Reg-

ister is described in Section 6.7.

FIGURE 6-4:

PIC16C54, PIC16CR54,

PIC16C55, PIC16C56,

PIC16CR56 REGISTER

FILE MAP

File Address

00h

01h

02h

03h

04h

05h

06h

07h

1Fh

INDF(1)

TMR0

PCL

STATUS

FSR

PORTA

PORTB

General

Purpose

Registers

Note 1: Not a physical register. See

Section 6.7.

2: PIC16C55 only, in all other devices this

is implemented as a a general purpose

PORTC(2)

08h

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