PIC16LC620-04SLASHSS datasheet(13/108 Pages) MICROCHIP

13 / 108 page

Preliminary

DS30235G-page 13

PIC16C62X

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC16C62X has a 13-bit program counter capable

of addressing an 8K x 14 program memory space. Only

the

ﬁrst

512

(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).

FIGURE 4-1:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16C620/PIC16C620A/

PIC16CR620A

PC<12:0>

000h

0004

0005

01FFh

0200h

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

FIGURE 4-2:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16C621/PIC16C621A

FIGURE 4-3:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16C622/PIC16C622A

PC<12:0>

000h

0004

0005

03FFh

0400h

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

PC<12:0>

000h

0004

0005

07FFh

0800h

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

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