PIC16C621A Microchip Technology Inc., PIC16C621A Datasheet - Page 15

• Manufacturer Part Number: PIC16C621A
• Description: Eprom-based 8-bit Cmos Microcontrollers
• Manufacturer: Microchip Technology Inc.

4.0
4.1
The PIC16C62X has a 13-bit program counter capable
of addressing an 8K x 14 program memory space. Only
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)
implemented. 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).
FIGURE 4-1:
 2003 Microchip Technology Inc.
CALL, RETURN
RETFIE, RETLW
MEMORY ORGANIZATION
Program Memory Organization
for
the
On-Chip Program
Stack Level 1
Stack Level 8
RESET Vector
Interrupt Vector
Stack Level 2
PIC16C622(A)
PC<12:0>
Memory
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16C620/PIC16C620A/
PIC16CR620A
13
are
000h
0004
0005
01FFh
0200h
1FFFh
physically
FIGURE 4-2:
FIGURE 4-3:
CALL, RETURN
RETFIE, RETLW
CALL, RETURN
RETFIE, RETLW
On-Chip Program
On-Chip Program
Stack Level 1
Stack Level 8
RESET Vector
Interrupt Vector
Stack Level 1
Stack Level 8
RESET Vector
Interrupt Vector
Stack Level 2
Stack Level 2
PC<12:0>
PC<12:0>
Memory
Memory
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16C621/PIC16C621A
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16C622/PIC16C622A
PIC16C62X
13
13
DS30235J-page 13
000h
0004
0005
03FFh
0400h
000h
0004
0005
07FFh
0800h
1FFFh
1FFFh