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PIC16C505-20/JW

14-Pin, 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16C505

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 (PCL), the Status

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

Register (FSR). In addition, Special Function

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 PIC16C505, the register file is composed of 8

Special Function Registers, 24 General Purpose

Registers and 48 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 (Section 4.8).

FIGURE 4-2: PIC16C505 REGISTER FILE MAP

FSR<6:5>

File Address

00h

01h

02h

03h

04h

05h

06h

00

INDF(1)

TMR0

PCL

STATUS

FSR

OSCCAL

PORTB

07h

PORTC

08h

General

Purpose

0Fh

Registers

10h

General

Purpose

Registers

1Fh

Bank 0

01

20h

10

40h

11

60h

Addresses map back to

addresses in Bank 0.

2Fh

30h

General

Purpose

Registers

3Fh

Bank 1

4Fh

50h

General

Purpose

Registers

5Fh

Bank 2

6Fh

70h

General

Purpose

Registers

7Fh

Bank 3

Note 1: Not a physical register.

DS40192C-page 12

© 1999 Microchip Technology Inc.

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