16F628 datasheet(17/168 Pages) MICROCHIP

17 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 15

PIC16F627A/628A/648A

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC16F627A/628A/648A has 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 PIC16F627A, 2K x 14 (0000h - 07FFh) for the

PIC16F628A and 4K x 14 (0000h - 0FFFh) for the

PIC16F648A are physically implemented. Accessing a

location above these boundaries will cause a wrap-

around within the first 1K x 14 space (PIC16F627A), 2K

x 14 space (PIC16F628A) or 4K x 14 space

(PIC16F648A). The RESET vector is at 0000h and the

interrupt vector is at 0004h (Figure 4-1).

FIGURE 4-1:

PROGRAM MEMORY MAP

AND STACK

4.2

Data Memory Organization

The data memory (Figure 4-2 and Figure 4-3) is

partitioned into four banks, which contain the general

purpose registers and the Special Function Registers

(SFR). The SFR’s are located in the first 32 locations of

each Bank. There are general purpose registers imple-

mented as static RAM in each Bank. Table 4-1 lists the

general purpose register available in each of the four

banks.

TABLE 4-1:

GENERAL PURPOSE STATIC

RAM REGISTERS

Addresses F0h-FFh, 170h-17Fh and 1F0h-1FFh are

implemented as common RAM and mapped back to

addresses 70h-7Fh.

Table 4-2 lists how to access the four banks of registers

via the STATUS Register bits RP1 and RP0.

TABLE 4-2:

ACCESS TO BANKS OF

REGISTERS

4.2.1

GENERAL PURPOSE REGISTER

FILE

The register file is organized as 224 x 8 in the

PIC16F627A/628A and 256 x 8 in the PIC16F648A.

Each is accessed either directly or indirectly through

the File Select Register (FSR), See Section 4.4.

PC<12:0>

000h

0004

0005

03FFh

1FFFh

Stack Level 1

Stack Level 8

RESET Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

Stack Level 2

07FFh

PIC16F627A,

PIC16F628A and

PIC16F648A

On-chip Program

Memory

PIC16F628A and

PIC16F648A

On-chip Program

Memory

PIC16F648A only

0FFFh

PIC16F627A/628A

PIC16F648A

Bank0

20-7Fh

Bank1

A0h-FF

Bank2

120h-14Fh, 170h-17Fh

120h-17Fh

Bank3

1F0h-1FFh

RP1

RP0

Bank0

Bank1

Bank2

Bank3

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