CF745 datasheet(15/217 Pages) MICROCHIP

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Preliminary

DS30453B-page 15

PIC16C5X

4.0

MEMORY ORGANIZATION

PIC16C5X memory is organized into program memory

and data memory. For devices with more than 512

bytes of program memory, a paging scheme is used.

Program memory pages are accessed using one or

two STATUS register bits. For devices with a data

memory register ﬁle of more than 32 registers, a

banking scheme is used. Data memory banks are

accessed using the File Selection Register (FSR).

4.1

Program Memory Organization

The PIC16C52 has a 9-bit Program Counter (PC)

capable of addressing a 384 x 12 program memory

space (Figure 4-1). The PIC16C54s, PIC16CR54s and

PIC16C55s have a 9-bit Program Counter (PC)

capable of addressing a 512 x 12 program memory

space (Figure 4-2). The PIC16C56s and PIC16CR56s

have a 10-bit Program Counter (PC) capable of

addressing a 1K x 12 program memor y space

(Figure 4-3). The PIC16CR57s, PIC16C58s and

PIC16CR58s have an 11-bit Program Counter capable

of addressing a 2K x 12 program memory space

(Figure 4-4). Accessing a location above the physically

implemented address will cause a wraparound.

The reset vector for the PIC16C52 is at 17Fh. A NOP

at the reset vector location will cause a restart at

location 000h. The reset vector for the PIC16C54s,

PIC16CR54s and PIC16C55s is at 1FFh. The reset

vector for the PIC16C56s and PIC16CR56s is at

3FFh. The reset v ector f or the PIC16C57s ,

PIC16CR57s, PIC16C58s, and PIC16CR58s is at

7FFh.

FIGURE 4-1:

PIC16C52 PROGRAM

MEMORY MAP AND STACK

PC<8:0>

Stack Level 1

Stack Level 2

000h

Reset Vector

On-chip Program

Memory

17Fh

CALL, RETLW

FIGURE 4-2:

PIC16C54s/CR54s/C55s

PROGRAM MEMORY MAP

AND STACK

FIGURE 4-3:

PIC16C56s/CR56s

PROGRAM MEMORY MAP

AND STACK

PC<8:0>

Stack Level 1

Stack Level 2

CALL, RETLW

000h

1FFh

Reset Vector

0FFh

100h

On-chip

Program

Memory

PC<9:0>

Stack Level 1

Stack Level 2

000h

1FFh

Reset Vector

0FFh

100h

On-chip Program

Memory (Page 0)

On-chip Program

Memory (Page 1)

200h

2FFh

300h

3FFh

CALL, RETLW

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