PIC16F684-ESLASHP datasheet(9/164 Pages) MICROCHIP

9 / 164 page

 2004 Microchip Technology Inc.

Preliminary

DS41202C-page 7

PIC16F684

2.0

MEMORY ORGANIZATION

2.1

Program Memory Organization

The PIC16F684 has a 13-bit program counter capable

of addressing an 8k x 14 program memory space. Only

the first 2k x 14 (0000h-07FFh) for the PIC16F684 is

physically implemented. Accessing a location above

these boundaries will cause a wrap around within the

first 2k 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

PIC16F684

2.2

Data Memory Organization

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

two banks, which contain the General Purpose Regis-

ters (GPR) and the Special Function Registers (SFR).

The Special Function Registers are located in the first

32 locations of each bank. Register locations 20h-7Fh

in Bank 0 and A0h-BFh in Bank 1 are General Purpose

Registers, implemented as static RAM. Register

locations F0h-FFh in Bank 1 point to addresses

70h-7Fh in Bank 0. 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

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

Note:

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

reserved

and

should

always

maintained as ‘0’s.

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