PIC16C781 datasheet(13/186 Pages) MICROCHIP

13 / 186 page

 2001 Microchip Technology Inc.

Preliminary

DS41171A-page 11

PIC16C781/782

2.0

MEMORY ORGANIZATION

There are two memory blocks in each of these

PICmicro® microcontrollers. Each block (program and

data memory) has its own bus, so that concurrent

access can occur.

Additional information on device memory may be found

in the PICmicro™ Mid-Range Reference Manual,

(DS33023).

2.1

Program Memory Organization

The PIC16C781/782 devices have a 13-bit program

counter capable of addressing an 8K x 14 program

memory space. The PIC16C781 has 1K x 14 words of

program memory. The PIC16C782 has 2K x 14 words

of program memory. Accessing a location above the

physically implemented address causes a wraparound.

The RESET vector is at 0000h and the interrupt vector

is at 0004h.

FIGURE 2-1:

PIC16C781 PROGRAM

MEMORY MAP AND

STACK

FIGURE 2-2:

PIC16C782 PROGRAM

MEMORY MAP AND

STACK

2.2

Data Memory Organization

The data memory is partitioned into multiple banks,

which contain the General Purpose Registers and the

Special Function Registers. Bits RP0 and RP1 are

bank select bits.

RP1 RP0

(STATUS<6:5>)

= 00

→ Bank0

= 01

→ Bank1

= 10

→ Bank2

= 11

→ Bank3

Each bank extends up to 7Fh (128 bytes). The lower

locations of each bank are reserved for the Special

Function Registers. Above the Special Function Regis-

ters are the General Purpose Registers, implemented

as static RAM. All implemented banks contain Special

Function Registers. Some frequently used Special

Function Registers from one bank are mirrored in

another bank for code reduction and quicker access.

PC<12:0>

0000h

0004h

0005h

Stack Level 1

Stack Level 8

RESET Vector

Interrupt Vector

On-Chip

CALL, RETURN

RETFIE, RETLW

Stack Level 2

Program

Memory

Page 0

03FFh

0400h

1FFFh

PC<12:0>

0000h

0004h

0005h

Stack Level 1

Stack Level 8

RESET Vector

Interrupt Vector

On-Chip

CALL, RETURN

RETFIE, RETLW

Stack Level 2

Program

Memory

Page 0

07FFh

0800h

1FFFh

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