PIC16LC554 datasheet(13/96 Pages) MICROCHIP

13 / 96 page

Preliminary

DS40143B-page 13

PIC16C55X(A)

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC16C55X(A) has a 13-bit program counter capa-

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

Only the ﬁrst 512 x 14 (0000h - 01FFh) for the

PIC16C554(A), 1K x 14 (0000h - 03FFh) for the

PIC16C556A and 2K x 14 (0000h - 07FFh) for the

PIC16C558(A) are physically implemented. Accessing

a location above these boundaries will cause a

wrap-around

within

the

ﬁrst

512

space

PIC16C554(A) or 1K x 14 space PIC16C556A or 2K x

14 space PIC16C558(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

PIC16C554/PIC6C554A

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

PIC16C556A

FIGURE 4-3:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16C558/PIC16C558A

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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