PIC16C641-04ESLASHTQ datasheet(17/136 Pages) MICROCHIP

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Preliminary

DS30559A-page 17

PIC16C64X & PIC16C66X

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC16C64X & PIC16C66X have a 13-bit program

counter capable of addressing an 8K x 14 program

memory space. For the PIC16C641 and PIC16C661

only the ﬁrst 2K x 14 (0000h - 07FFh) is physically

implemented. For the PIC16C642 and PIC16C662 only

the ﬁrst 4K x 14 (0000h - 0FFh) is physically imple-

mented. Accessing a location above the 2K or 4K

boundary will cause a wrap-around. The reset vector is

at 0000h and the interrupt vector is at 0004h (Figure 4-

1 and Figure 4-2). See Section 4.4 for Program Mem-

ory paging.

FIGURE 4-1:

PIC16C641/661 PROGRAM

MEMORY MAP AND STACK

PC<12:0>

0000h

0004h

0005h

07FFh

0800h

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

2000h

2007h

3FFFh

TEST

Conﬁguration Word

TEST

FIGURE 4-2:

PIC16C642/662 PROGRAM

MEMORY MAP AND STACK

PC<12:0>

0000h

0004h

0005h

0FFFh

1000h

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

2000h

2007h

3FFFh

TEST

Conﬁguration Word

TEST

Page0

On-chip Program

Memory

Page1

07FFh

0800h

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