參數(shù)資料
型號(hào): PIC16LC715
廠商: Microchip Technology Inc.
英文描述: 8-Bit CMOS Microcontrollers with A/D Converter
中文描述: 8位CMOS微控制器與A / D轉(zhuǎn)換器
文件頁數(shù): 64/176頁
文件大?。?/td> 803K
代理商: PIC16LC715
PIC16C71X
DS30272A-page 64
1997 Microchip Technology Inc.
8.6
During an interrupt, only the return PC value is saved
on the stack. Typically, users may wish to save key reg-
isters during an interrupt i.e., W register and STATUS
register. This will have to be implemented in software.
Example 8-1 stores and restores the STATUS and W
registers. The user register, STATUS_TEMP, must be
defined in bank 0.
The example:
a)
Stores the W register.
b)
Stores the STATUS register in bank 0.
c)
Executes the ISR code.
d)
Restores the STATUS register (and bank select
bit).
e)
Restores the W register.
Context Saving During Interrupts
EXAMPLE 8-1:
MOVWF W_TEMP ;Copy W to TEMP register, could be bank one or zero
SWAPF STATUS,W ;Swap status to be saved into W
MOVWF STATUS_TEMP ;Save status to bank zero STATUS_TEMP register
:
:(ISR)
:
SWAPF STATUS_TEMP,W ;Swap STATUS_TEMP register into W
;(sets bank to original state)
MOVWF STATUS ;Move W into STATUS register
SWAPF W_TEMP,F ;Swap W_TEMP
SWAPF W_TEMP,W ;Swap W_TEMP into W
SAVING STATUS AND W REGISTERS IN RAM
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