PIC16C641 Datasheet

IC型号：
PIC16C641
PDF描述：
8-Bit EPROM Microcontrollers with Analog Comparators
文件大小：
661.21KB
PDF页数：
137页
芯片厂家：
MICROCHIP

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PIC16C64X & PIC16C66X

9.6

Context Saving During Interrupts

Example 9-1:

Stores the W register regardless of current bank

Stores the STATUS register in Bank 0

Executes the ISR code

Restores the STATUS (and bank select bit

鈥?Restores the W register

鈥?/div>

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 e.g. W register and STATUS

Example 9-1 stores and restores the STATUS and W

registers. The user register, W_TEMP, must be de铿乶ed

in both banks and must be de铿乶ed at the same offset

from the bank base address (i.e., W_TEMP is de铿乶ed

at 0x70 - 0x7F in Bank 0). The user register,

STATUS_TEMP, must be de铿乶ed in Bank 0.

EXAMPLE 9-1:

SAVING THE STATUS AND W REGISTERS IN RAM

Copy W to a Temporary Register regardless of current bank

Swap STATUS nibbles and place into W register

Change to Bank 0 regardless of current bank

Save STATUS to a Temporary register in Bank 0

Routine)

Swap original STATUS register value into W (restores original bank)

Restore STATUS register from W register

Swap W_Temp nibbles and return value to W_Temp

Swap W_Temp to W to restore original W value without affecting STATUS

MOVWF

W_TEMP

;

SWAPF

STATUS,W

;

BCF

STATUS,RP0

;

MOVWF

STATUS_TEMP

;

: (Interrupt Service

SWAPF

STATUS_TEMP,W ;

MOVWF

STATUS

;

SWAPF

W_TEMP,F

;

SWAPF

W_TEMP,W

;

DS30559A-page 68

Preliminary

漏

1996 Microchip Technology Inc.

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