PIC16C433 datasheet(13/126 Pages) MICROCHIP

13 / 126 page

 2002 Microchip Technology Inc.

Preliminary

DS41139B-page 11

PIC16C433

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC16C433 has a 13-bit program counter capable

of addressing an 8K x 14 program memory space.

For the PIC16C433, the first 2K x 14 (0000h-07FFh) is

implemented. Accessing a location above the physi-

cally implemented address will cause a wraparound.

The RESET Vector is at 0000h and the interrupt vector

is at 0004h.

FIGURE 4-1:

PIC16C433 PROGRAM

MEMORY MAP AND STACK

4.2

Data Memory Organization

The data memory is partitioned into two banks, which

contain the General Purpose Registers and the Special

Function Registers. Bit RP0 is the bank select bit.

RP0 (STATUS<5>) = 1

→ Bank 1

RP0 (STATUS<5>) = 0

→ Bank 0

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 General Purpose Registers implemented as

static RAM. Both Bank 0 and Bank 1 contain Special

Function Registers. Some "high use" Special Function

Registers from Bank 0 are mirrored in Bank 1 for code

reduction and quicker access.

Also note that F0h through FFh on the PIC16C433 is

mapped into Bank 0 registers 70h-7Fh as common

RAM.

4.2.1

GENERAL PURPOSE REGISTER FILE

The register file can be accessed either directly or indi-

rectly

through

the

File

Select

FSR

(Section 4.5).

PC<12:0>

0000h

0004h

0005h

07FFh

1FFFh

Stack Level 1

Stack Level 8

RESET Vector

On-Chip Program

Memory

CALL, RETURN

RETFIE, RETLW

0800h

0400h

03FFh

Peripheral Interrupt Vector

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