PIC16C54T-LP datasheet(27/194 Pages) MICROCHIP

27 / 194 page

Preliminary

DS30453D-page 25

PIC16C5X

6.0

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

scheme is used. Data memory banks are accessed

using the File Selection Register (FSR).

6.1

Program Memory Organization

The PIC16C54, PIC16CR54 and PIC16C55 have a 9-

bit Program Counter (PC) capable of addressing a 512

x 12 program memory space (Figure 6-1). The

PIC16C56 and PIC16CR56 have a 10-bit Program

Counter (PC) capable of addressing a 1K x 12 program

memory

space

(Figure 6-2).

The

PIC16CR57,

PIC16C58 and PIC16CR58 have an 11-bit Program

Counter capable of addressing a 2K x 12 program

memory space (Figure 6-3). Accessing a location

above the physically implemented address will cause a

wraparound.

A NOP at the RESET vector location will cause a restart

at location 000h. The RESET vector for the PIC16C54,

PIC16CR54 and PIC16C55 is at 1FFh. The RESET

vector for the PIC16C56 and PIC16CR56 is at 3FFh.

The RESET vector for the PIC16C57, PIC16CR57,

PIC16C58,

and

PIC16CR58

7FFh.

See

Section 6.5 for additional information using CALL and

GOTO

instructions.

FIGURE 6-1:

PIC16C54/CR54/C55

PROGRAM MEMORY MAP

AND STACK

FIGURE 6-2:

PIC16C56/CR56

PROGRAM MEMORY MAP

AND STACK

FIGURE 6-3:

PIC16C57/CR57/C58/

CR58 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

PC<10:0>

Stack Level 1

Stack Level 2

000h

1FFh

RESET Vector

0FFh

100h

On-chip Program

Memory (Page 0)

On-chip Program

Memory (Page 1)

On-chip Program

Memory (Page 2)

On-chip Program

Memory (Page 3)

200h

3FFh

2FFh

300h

400h

5FFh

4FFh

500h

600h

7FFh

6FFh

700h

CALL, RETLW

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