PIC16C62X
FIGURE 4-2: PROGRAM MEMORY MAP
AND STACK FOR THE
4.0
MEMORY ORGANIZATION
4.1
Program Memory Organization
PIC16C621/PIC16C621A
The PIC16C62X has a 13-bit program counter capable
of addressing an 8K x 14 program memory space. Only
PC<12:0>
CALL, RETURN
RETFIE, RETLW
13
the first 512
x 14 (0000h - 01FFh) for the
PIC16C620(A) and PIC16CR620, 1K x 14 (0000h -
03FFh) for the PIC16C621(A) and 2K x 14 (0000h -
07FFh) for the PIC16C622(A) are physically imple-
mented. Accessing a location above these boundaries
will cause a wrap-around within the first 512 x 14 space
(PIC16C(R)620(A)) or 1K x 14 space (PIC16C621(A))
or 2K x 14 space (PIC16C622(A)). The reset vector is
at 0000h and the interrupt vector is at 0004h
(Figure 4-1, Figure 4-2, Figure 4-3).
Stack Level 1
Stack Level 2
Stack Level 8
Reset Vector
000h
FIGURE 4-1: PROGRAM MEMORY MAP
AND STACK FOR THE
Interrupt Vector
0004
0005
PIC16C620/PIC16C620A/
PIC16CR620A
On-chip Program
Memory
PC<12:0>
CALL, RETURN
RETFIE, RETLW
13
03FFh
0400h
Stack Level 1
Stack Level 2
1FFFh
FIGURE 4-3: PROGRAM MEMORY MAP
AND STACK FOR THE
Stack Level 8
PIC16C622/PIC16C622A
Reset Vector
000h
PC<12:0>
CALL, RETURN
RETFIE, RETLW
13
Stack Level 1
Stack Level 2
Interrupt Vector
0004
0005
On-chip Program
Memory
Stack Level 8
Reset Vector
000h
01FFh
0200h
Interrupt Vector
0004
0005
1FFFh
On-chip Program
Memory
07FFh
0800h
1FFFh
1998 Microchip Technology Inc.
Preliminary
DS30235G-page 13
MICROCHIP [ MICROCHIP ]
