PIC17C752-08SLASHCL datasheet(39/328 Pages) MICROCHIP

39 / 328 page

DS30289A-page 39

PIC17C7XX

EXAMPLE 6-1:

SAVING STATUS AND WREG IN RAM (SIMPLE)

; The addresses that are used to store the CPUSTA and WREG values must be in the data memory

; address range of 1Ah - 1Fh. Up to 6 locations can be saved and restored using the MOVFP

; instruction. This instruction neither affects the status bits, nor corrupts the WREG register.

;

UNBANK1

EQU

0x01A

; Address for 1st location to save

UNBANK2

EQU

0x01B

; Address for 2nd location to save

UNBANK3

EQU

0x01C

; Address for 3rd location to save

UNBANK4

EQU

0x01D

; Address for 4th location to save

UNBANK5

EQU

0x01E

; Address for 5th location to save

;

(Label Not used in program)

UNBANK6

EQU

0x01F

; Address for 6th location to save

;

(Label Not used in program)

;

; At Interrupt Vector Address

PUSH

MOVFP

ALUSTA, UNBANK1

; Push ALUSTA value

MOVFP

BSR, UNBANK2

; Push BSR value

MOVFP

WREG, UNBANK3

; Push WREG value

MOVFP

PCLATH, UNBANK4

; Push PCLATH value

;

; Interrupt Service Routine (ISR) code

;

POP

MOVFP

UNBANK4, PCLATH

; Restore PCLATH value

MOVFP

UNBANK3, WREG

; Restore WREG value

MOVFP

UNBANK2, BSR

; Restore BSR value

MOVFP

UNBANK1, ALUSTA

; Restore ALUSTA value

;

RETFIE

; Return from interrupt (enable interrupts)

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