PIC16F684 datasheet(9/192 Pages) MICROCHIP

9 / 192 page

DS41202F-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 Registers

(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. The RP0 bit of the STATUS register is the

bank select bit.

RP0

→ Bank 0 is selected

→ Bank 1 is selected

PC<12:0>

0000h

0004h

0005h

07FFh

0800h

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

Wraps to 0000h-07FFh

Note:

The IRP and RP1 bits of the STATUS

maintained as ‘0’s.

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