PIC16F87X
2.0
MEMORY ORGANIZATION
FIGURE 2-2:
There are three memory blocks in each of these
PICmicro MCUs. The Program Memory and Data
Memory have separate buses so that concurrent
access can occur and is detailed in this section. The
EEPROM data memory block is detailed in
Additional information on device memory may be found
in the PICmicro™ Mid-Range Reference Manual,
(DS33023).
PIC16F874/873 PROGRAM
MEMORY MAP AND STACK
PC<12:0>
CALL, RETURN
RETFIE, RETLW
13
Stack Level 1
Stack Level 2
2.1
Program Memory Organization
Stack Level 8
The PIC16F87X devices have a 13-bit program counter
capable of addressing an 8K x 14 program memory
space. The PIC16F877/876 devices have 8K x 14
words of FLASH program memory and the PIC16F873/
874 devices have 4K x 14. Accessing a location above
the physically implemented address will cause a wrap-
around.
The reset vector is at 0000h and the interrupt vector is
at 0004h.
Reset Vector
0000h
Interrupt Vector
0004h
0005h
On-Chip
Program
Memory
Page 0
07FFh
0800h
Page 1
0FFFh
1000h
FIGURE 2-1:
PIC16F877/876 PROGRAM
MEMORY MAP AND STACK
PC<12:0>
CALL, RETURN
RETFIE, RETLW
13
1FFFh
Stack Level 1
Stack Level 2
Stack Level 8
Reset Vector
0000h
Interrupt Vector
0004h
0005h
Page 0
07FFh
0800h
Page 1
On-Chip
Program
Memory
Page 2
17FFh
1800h
Page 3
1FFFh
0FFFh
1000h
©
1999 Microchip Technology Inc.
DS30292B-page 11
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