12C508 datasheet(14/113 Pages) MICROCHIP

14 / 113 page

PIC12C5XX

DS40139E-page 14

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

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 PIC12C508, PIC12C508A and PIC12CE518,

the register file is composed of 7 special function

registers and 25 general purpose registers (Figure 4-

2).

For the PIC12C509, PIC12C509A, PIC12CR509A,

and PIC12CE519 the register file is composed of 7

special

function

registers,

general

purpose

registers, and 16 general purpose registers that may

be addressed using a banking scheme (Figure 4-3).

4.2.1

GENERAL PURPOSE REGISTER FILE

The general purpose register file is accessed either

directly or indirectly through the file select register FSR

(Section 4.8).

FIGURE 4-2:

PIC12C508, PIC12C508A AND

PIC12CE518 REGISTER FILE

MAP

File Address

00h

01h

02h

03h

04h

05h

06h

07h

1Fh

INDF(1)

TMR0

PCL

STATUS

FSR

OSCCAL

GPIO

General

Purpose

Registers

Note

Not a physical register. See Section 4.8

FIGURE 4-3:

PIC12C509, PIC12C509A, PIC12CR509A AND PIC12CE519 REGISTER FILE MAP

File Address

00h

01h

02h

03h

04h

05h

06h

07h

1Fh

INDF(1)

TMR0

PCL

STATUS

FSR

OSCCAL

GPIO

0Fh

10h

Bank 0

Bank 1

3Fh

30h

20h

2Fh

General

Purpose

Registers

General

Purpose

Registers

General

Purpose

Registers

Addresses map

back to

addresses

in Bank 0.

Note

Not a physical register. See Section 4.8

FSR<6:5>

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