10F222 datasheet(15/86 Pages) MICROCHIP

15 / 86 page

DS41270E-page 13

PIC10F220/222

4.0

MEMORY ORGANIZATION

The PIC10F220/222 memories are organized into pro-

gram memory and data memory. Data memory banks

are accessed using the File Select Register (FSR).

4.1

Program Memory Organization for

the PIC10F220

The PIC10F220 devices have a 9-bit Program Counter

(PC) capable of addressing a 512 x 12 program

memory space.

Only the first 256 x 12 (0000h-00FFh) for the

PIC10F220

are

physically

implemented

(see

Figure 4-1). Accessing a location above these

boundaries will cause a wrap-around within the first

256 x 12 space (PIC10F220). The effective Reset

vector is at 0000h, (see Figure 4-1). Location 00FFh

(PIC10F220) contains the internal clock oscillator

calibration value. This value should never be

overwritten.

FIGURE 4-1:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC10F220

4.2

Program Memory Organization for

the PIC10F222

The PIC10F222 devices have a 10-bit Program

Counter (PC) capable of addressing a 1024 x 12

program memory space.

Only the first 512 x 12 (0000h-01FFh) for the Mem-

High are physically implemented (see Figure 4-2).

Accessing a location above these boundaries will

cause a wrap-around within the first 512 x 12 space

(PIC10F222). The effective Reset vector is at 0000h,

(see Figure 4-2). Location 01FFh (PIC10F222) con-

tains the internal clock oscillator calibration value.

This value should never be overwritten.

FIGURE 4-2:

PROGRAM MEMORY MAP

AND STACK FOR THE

PIC10F222

CALL, RETLW

PC<7:0>

Stack Level 1

Stack Level 2

0000h

01FFh

On-chip Program

Memory

Reset Vector(1)

Note

Address 0000h becomes the

effective Reset vector. Location 00FFh

contains the MOVLW XX internal oscillator

calibration value.

256 Word

00FFh

0100h

<8:0>

CALL, RETLW

PC<8:0>

Stack Level 1

Stack Level 2

0000h

02FFh

Reset Vector(1)

Note

Address 0000h becomes the effective

Reset vector. Location 01FFh contains the

MOVLW XX

internal oscillator calibration

value.

512 Words

01FFh

0200h

On-chip Program

Memory

<9:0>

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