PIC12C67X
4.0
4.1
MEMORY ORGANIZATION
Program Memory Organization
4.2
Data Memory Organization
The PIC12C67X has a 13-bit program counter capable
of addressing an 8K x 14 program memory space.
For the PIC12C671 and the PIC12CE673, the first 1K x
14 (0000h-03FFh) is implemented.
For the PIC12C672 and the PIC12CE674, the first 2K
x 14 (0000h-07FFh) is implemented. Accessing a loca-
tion above the physically implemented address will
cause a wraparound. The reset vector is at 0000h and
the interrupt vector is at 0004h.
The data memory is partitioned into two banks, which
contain the General Purpose Registers and the Special
Function Registers. Bit RP0 is the bank select bit.
RP0 (STATUS<5>) = 1
→
Bank 1
RP0 (STATUS<5>) = 0
→
Bank 0
Each Bank extends up to 7Fh (128 bytes). The lower
locations of each Bank are reserved for the Special
Function Registers. Above the Special Function Regis-
ters are General Purpose Registers implemented as
static RAM. Both Bank 0 and Bank 1 contain Special
Function Registers. Some "high use" Special Function
Registers from Bank 0 are mirrored in Bank 1 for code
reduction and quicker access.
Also note that F0h through FFh on the PIC12C67X is
mapped into Bank 0 registers 70h-7Fh as common
RAM.
4.2.1
GENERAL PURPOSE REGISTER FILE
FIGURE 4-1:
PIC12C67X PROGRAM
MEMORY MAP AND STACK
PC<12:0>
CALL, RETURN
RETFIE, RETLW
13
The register file can be accessed either directly or indi-
rectly through the File Select Register FSR
Stack Level 1
Stack Level 8
Reset Vector
0000h
Peripheral Interrupt Vector
0004h
0005h
On-Chip Program
Memory
(PIC12C672 and
PIC12CE674 only)
03FFh
0400h
07FFh
0800h
1FFFh
©
1999 Microchip Technology Inc.
DS30561B-page 11
MICROCHIP [ MICROCHIP TECHNOLOGY ]
