PIC16C5X
4.2
Data Memory Organization
FIGURE 4-5: PIC16C52, PIC16C54s,
PIC16CR54s, PIC16C55s,
PIC16C56s, PIC16CR56s
REGISTER FILE MAP
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.
File Address
INDF(1)
TMR0
PCL
00h
01h
02h
03h
04h
05h
06h
07h
The special function registers include the TMR0
register, 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.
STATUS
FSR
PORTA
PORTB
The general purpose registers are used for data and
control information under command of the instructions.
PORTC(2)
For the PIC16C52, PIC16C54s, PIC16CR54s,
PIC16C56s and PIC16CR56s, the register file is
composed of 7 special function registers and 25
general purpose registers (Figure 4-5).
General
Purpose
Registers
0Fh
10h
For the PIC16C55s, the register file is composed of 8
special function registers and 24 general purpose
registers.
For the PIC16C57s and PIC16CR57s, 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 4-6).
1Fh
Note 1: Not a physical register. See Section 4.7
2: PIC16C55s only, others are a general
purpose register.
For the PIC16C58s and PIC16CR58s, 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 4-7).
4.2.1
GENERAL PURPOSE REGISTER FILE
The register file is accessed either directly or indirectly
through the file select register FSR (Section 4.7).
1998 Microchip Technology Inc.
Preliminary
DS30453B-page 17
MICROCHIP [ MICROCHIP ]
