PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 37

• Manufacturer Part Number: PIC17C752
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

EXAMPLE 6-1:
; 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
UNBANK2
UNBANK3
UNBANK4
UNBANK5
UNBANK6
;
PUSH
POP
;
1997 Microchip Technology Inc.
:
MOVFP
MOVFP
MOVFP
MOVFP
;
:
;
MOVFP
MOVFP
MOVFP
MOVFP
RETFIE
EQU
EQU
EQU
EQU
EQU
EQU
ALUSTA, UNBANK1
BSR, UNBANK2
WREG, UNBANK3
PCLATH, UNBANK4
UNBANK4, PCLATH
UNBANK3, WREG
UNBANK2, BSR
UNBANK1, ALUSTA
SAVING STATUS AND WREG IN RAM (SIMPLE)
0x01A
0x01B
0x01C
0x01D
0x01E
0x01F
; Address for 1st location to save
; Address for 2nd location to save
; Address for 3rd location to save
; Address for 4th location to save
; Address for 5th location to save
;
; Address for 6th location to save
;
; At Interrupt Vector Address
; Push ALUSTA value
; Push BSR value
; Push WREG value
; Push PCLATH value
; Interrupt Service Routine (ISR) code
; Restore PCLATH value
; Restore WREG value
; Restore BSR value
; Restore ALUSTA value
; Return from interrupt (enable interrupts)
(Label Not used in program)
(Label Not used in program)
Preliminary
DS30264A-page 37