PIC12CE673 datasheet(11/116 Pages) MICROCHIP

11 / 116 page

Preliminary

DS40181B-page 11

PIC12CE67X

4.0

MEMORY ORGANIZATION

4.1

Program Memory Organization

The PIC12CE67X has a 13-bit program counter capa-

ble of addressing an 8K x 14 program memory space.

For the PIC12CE673 the ﬁrst 1K x 14 (0000h-03FFh) is

implemented.

For the PIC12CE674, 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:

PIC12CE67X PROGRAM

MEMORY MAP AND STACK

PC<12:0>

0000h

0004h

0005h

07FFh

1FFFh

Stack Level 1

Stack Level 8

Reset Vector

Interrupt Vector

On-chip Program

Memory

CALL, RETURN

RETFIE, RETLW

0800h

0400h

03FFh

Peripheral

(PIC12CE674 only)

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 PIC12CE67X 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).

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