RFPIC12C509AG Microchip Technology Inc., RFPIC12C509AG Datasheet - Page 18

• Manufacturer Part Number: RFPIC12C509AG
• Description: 18/20-pin 8-bit Cmos Microcontroller With Uhf Ask/fsk Transmitter
• Manufacturer: Microchip Technology Inc.

rfPIC12C509AG/509AF
4.2
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.
FIGURE 4-2:
DS70031A-page 16
Data Memory Organization
rfPIC12C509AG/509AF REGISTER FILE MAP
File Address
FSR<6:5>
Note 1: Not a physical register. See Section 4.8
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
1Fh
10h
Preliminary
General
Purpose
Registers
OSCCAL
General
Purpose
Registers
STATUS
INDF
TMR0
Bank 0
GPIO
PCL
FSR
00
(1)
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
The general purpose register file is accessed either
directly or indirectly through the file select register FSR
3Fh
30h
2Fh
20h
Addresses map
back to
addresses
in Bank 0.
General
Purpose
Registers
Bank 1
01
GENERAL PURPOSE REGISTER
FILE
©
2001 Microchip Technology Inc.