PIC16F876AT-IL View Datasheet(PDF) - Microchip Technology
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PIC16F876AT-IL Datasheet PDF : 234 Pages
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2.0 MEMORY ORGANIZATION
There are three memory blocks in each of the
PIC16F87XA devices. 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 Section 3.0
“Data EEPROM and Flash Program Memory”.
Additional information on device memory may be found
in the PICmicro® Mid-Range MCU Family Reference
Manual (DS33023).
PIC16F87XA
2.1 Program Memory Organization
The PIC16F87XA devices have a 13-bit program
counter capable of addressing an 8K word x 14 bit
program memory space. The PIC16F876A/877A
devices have 8K words x 14 bits of Flash program
memory, while PIC16F873A/874A devices have
4K words x 14 bits. Accessing a location above the
physically implemented address will cause a
wraparound.
The Reset vector is at 0000h and the interrupt vector is
at 0004h.
FIGURE 2-1:
PIC16F876A/877A
PROGRAM MEMORY MAP
AND STACK
PC<12:0>
CALL, RETURN
13
RETFIE, RETLW
Stack Level 1
Stack Level 2
Stack Level 8
Reset Vector
0000h
On-Chip
Program
Memory
Interrupt Vector
Page 0
Page 1
Page 2
Page 3
0004h
0005h
07FFh
0800h
0FFFh
1000h
17FFh
1800h
1FFFh
FIGURE 2-2:
PIC16F873A/874A
PROGRAM MEMORY MAP
AND STACK
PC<12:0>
CALL, RETURN
13
RETFIE, RETLW
Stack Level 1
Stack Level 2
Stack Level 8
Reset Vector
0000h
On-Chip
Program
Memory
Interrupt Vector
Page 0
Page 1
0004h
0005h
07FFh
0800h
0FFFh
1000h
1FFFh
2003 Microchip Technology Inc.
DS39582B-page 15
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