PIC16F5X
3.2.1
GENERAL PURPOSE REGISTER
FILE
3.2
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 (SFR)
and General Purpose Registers (GPR).
The register file is accessed either directly or indirectly
through the File Select Register (FSR). The FSR
register is described in Section 3.7 “Indirect Data
Addressing; INDF and FSR Registers”.
The Special Function Registers include the TMR0
register, the Program Counter (PC), the STATUS regis-
ter, 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.
FIGURE 3-3:
PIC16F54 REGISTER FILE
MAP
File Address
INDF(1)
TMR0
PCL
00h
01h
02h
03h
04h
05h
06h
The General Purpose Registers are used for data and
control information under command of the instructions.
STATUS
FSR
For the PIC16F54, the register file is composed of 7
Special Function Registers and 25 General Purpose
Registers (Figure 3-3).
PORTA
PORTB
For the PIC16F57, the register file is composed of 8
Special Function Registers,
8 General Purpose
07h
Registers and 64 additional General Purpose
Registers that may be addressed using a banking
scheme (Figure 3-4).
General
Purpose
Registers
For the PIC16F59, the register file is composed of 10
Special Function Registers,
6 General Purpose
Registers and 128 additional General Purpose
Registers that may be addressed using a banking
scheme (Figure 3-5).
1Fh
Note 1: Not a physical register. See Section 3.7
“Indirect Data Addressing; INDF and FSR
Registers”.
FIGURE 3-4:
PIC16F57 REGISTER FILE MAP
FSR<6:5>
00
01
10
11
File Address
00h
INDF(1)
TMR0
PCL
20h
40h
60h
01h
02h
03h
04h
05h
06h
STATUS
FSR
Addresses map back to
addresses in Bank 0.
PORTA
PORTB
07h
08h
PORTC
General
Purpose
Registers
2Fh
30h
4Fh
50h
6Fh
0Fh
10h
70h
General
Purpose
Registers
General
Purpose
Registers
General
Purpose
Registers
General
Purpose
Registers
1Fh
3Fh
5Fh
7Fh
Bank 0
Bank 1
Bank 2
Bank 3
Note 1: Not a physical register. See Section 3.7 “Indirect Data Addressing; INDF and FSR Registers”.
DS41213D-page 14
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
