PIC16F676-ESLASHST datasheet(9/130 Pages) MICROCHIP

9 / 130 page

DS40039E-page 7

PIC16F630/676

2.0

MEMORY ORGANIZATION

2.1

Program Memory Organization

The PIC16F630/676 devices have a 13-bit program

counter capable of addressing an 8K x 14 program

memory space. Only the first 1K x 14 (0000h - 03FFh)

for the PIC16F630/676 devices is physically imple-

mented. Accessing a location above these boundaries

will cause a wrap around within the first 1K x 14 space.

The RESET vector is at 0000h and the interrupt vector

is at 0004h (see Figure 2-1).

FIGURE 2-1:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC16F630/676

2.2

Data Memory Organization

The data memory (see Figure 2-2) is partitioned into

two banks, which contain the General Purpose regis-

ters and the Special Function registers. The Special

Function registers are located in the first 32 locations of

each bank. Register locations 20h-5Fh are General

Purpose registers, implemented as static RAM and are

mapped across both banks. All other RAM is

unimplemented and returns ‘0’ when read. RP0

(STATUS<5>) is the bank select bit.

• RP0 = 0 Bank 0 is selected

• RP0 = 1 Bank 1 is selected

2.2.1

GENERAL PURPOSE REGISTER

FILE

The register file is organized as 64 x 8 in the

PIC16F630/676 devices. Each register is accessed,

either directly or indirectly, through the File Select

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

Note:

The IRP and RP1 bits STATUS<7:6> are

reserved and should always be maintained

as ‘0’s.

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