RFPIC12C509AF datasheet(18/104 Pages) MICROCHIP

18 / 104 page

rfPIC12C509AG/509AF

DS70031A-page 16

Preliminary

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 gen-

eral purpose registers.

The special function registers include the TMR0 regis-

ter, 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 rfPIC12C509AG/509AF, the register file is com-

posed of 7 special function registers, 25 general pur-

pose registers, and 16 general purpose registers that

may be addressed using a banking scheme (Figure 4-

2).

4.2.1

GENERAL PURPOSE REGISTER

FILE

The general purpose register file is accessed either

directly or indirectly through the file select register FSR

FIGURE 4-2:

rfPIC12C509AG/509AF 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 1: Not a physical register. See Section 4.8

FSR<6:5>

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