DM163006 datasheet(51/320 Pages) MICROCHIP

51 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 51

PIC18C601/801

EXAMPLE 4-5:

COMBINATION UNLOCK MACRO EXAMPLE CODE

FIGURE 4-7:

THE DATA MEMORY MAP FOR PIC18C801/601 (PGRM = 0)

UNLOCK_N_MODIFY @REG

MACRO

BCF INTCON, GIE

; Disable interrupts

BSF PSPCON, CMLK1

BSF PSPCON, CMLK0

MOVWF @REG

; Modify given register

BSF INTCON, GIE

; Enable interrupts

ENDM

•

MOVLW 5Ah

; Preload WREG for OSCCON register

UNLOCK_N_MODIFY OSCCON

; Modify OSCCON

Bank 0

Bank 1

Bank 14

Bank 15

Data Memory Map

BSR<3:0>

= 0000b

= 0001b

= 1111b

080h

07Fh

F80h

FFFh

When a = 0,

the BSR is ignored and this

Access RAM bank is used.

The first 128 bytes are General

Purpose RAM (from Bank 0).

The next 128 bytes are Special

Function Registers (from

Bank 15).

When a = 1,

the BSR is used to specify

the RAM location that the

instruction uses.

Bank 3

Bank 2

F7Fh

F00h

EFFh

3FFh

300h

2FFh

200h

1FFh

100h

0FFh

000h

= 0011b

= 0010b

Access GPR’s

FFh

00h

FFh

00h

FFh

00h

FFh

00h

FFh

00h

GPR

Access SFR’s

Unused

Bank 6

Unused

Read ’00h’

= 1110b

= 0110b

5FFh

500h

4FFh

400h

FFh

00h

FFh

00h

7Fh

FFh

Access RAM Bank

Access Bank High

Access Bank Low

(GPR’s)

(SFR’s)

80h

Bank 4

= 0100b

Bank 5

= 0101b

GPR

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