PIC16C554 datasheet(13/108 Pages) MICROCHIP

13 / 108 page

 1996-2013 Microchip Technology Inc.

Preliminary

DS40143E-page 13

PIC16C55X

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC16C55X has a 13-bit program counter capable

of addressing an 8 K x 14 program memory space.

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

PIC16C554 and 2K x 14 (0000h - 07FFh) for the

PIC16C557 and PIC16C558 are physically imple-

mented. Accessing a location above these boundaries

will cause a wrap-around within the first 512 x 14

spaces in the PIC16C554, or 2K x 14 space of the

PIC16C558 and PIC16C557. The RESET vector is at

0000h and the interrupt vector is at 0004h (Figure 4-1,

Figure 4-2).

FIGURE 4-1:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16C554

FIGURE 4-2:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16C557 AND

PIC16C558

4.2

Data Memory Organization

The data memory (Figure 4-3 through Figure 4-5) is

partitioned into two banks which contain the General

Purpose Registers (GPR) and the Special Function

Registers (SFR). Bank 0 is selected when the RP0 bit

(STATUS <5>) is cleared. Bank 1 is selected when the

RP0 bit is set. The Special Function Registers are

located in the first 32 locations of each Bank. Register

locations 20-6Fh (Bank 0) on the PIC16C554 and 20-

7Fh (Bank 0) and A0-BFh (Bank 1) on the PIC16C558

and PIC16C557 are General Purpose Registers imple-

mented as static RAM. Some special purpose registers

are mapped in Bank 1.

4.2.1

GENERAL PURPOSE REGISTER

FILE

The register file is organized as 80 x 8 in the

PIC16C554 and 128 x 8 in the PIC16C557 and

PIC16C558. Each can be accessed either directly or

indirectly through the File Select Register, FSR

(Section 4.4).

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

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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