Datasheet

PIC16C505
DS40192D-page 12  1999-2012 Microchip Technology Inc.
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
File Address
00h
01h
02h
03h
04h
05h
06h
07h
1Fh
INDF
(1)
TMR0
PCL
STATUS
FSR
OSCCAL
PORTB
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.
FSR<6:5> 00 01
Bank 3
7Fh
70h
60h
6Fh
General
Purpose
Registers
11
Bank 2
5Fh
50h
40h
4Fh
General
Purpose
Registers
10
08h
PORTC