參數(shù)資料
型號(hào): KSZ8851-16MQL
廠商: Micrel Inc
文件頁(yè)數(shù): 45/88頁(yè)
文件大小: 0K
描述: IC CTLR MAC/PHY NON-PCI 128-PQFP
產(chǎn)品培訓(xùn)模塊: KSZ8851 10/100 Embedded Controllers
標(biāo)準(zhǔn)包裝: 66
控制器類型: 以太網(wǎng)控制器,MAC/PHY
接口: 總線
電源電壓: 1.8V,2.5V,3.3V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 128-BFQFP
供應(yīng)商設(shè)備封裝: 128-PQFP(14x20)
包裝: 托盤
產(chǎn)品目錄頁(yè)面: 1081 (CN2011-ZH PDF)
配用: 576-3292-ND - BOARD EVALUATION KSZ8851-16MLL
其它名稱: 576-3253
PIC16F8X
DS30430C-page 50
1998 Microchip Technology Inc.
8.10
Context Saving During Interrupts
During an interrupt, only the return PC value is saved
on the stack. Typically, users wish to save key register
values during an interrupt (e.g., W register and
STATUS register). This is implemented in software.
Example 8-1 stores and restores the STATUS and W
register’s values. The User defined registers, W_TEMP
and STATUS_TEMP are the
temporary
storage
locations for the W and STATUS registers values.
Example 8-1 does the following:
a)
Stores the W register.
b)
Stores the STATUS register in STATUS_TEMP.
c)
Executes the Interrupt Service Routine code.
d)
Restores the STATUS (and bank select bit)
register.
e)
Restores the W register.
EXAMPLE 8-1:
SAVING STATUS AND W REGISTERS IN RAM
PUSH
MOVWF
W_TEMP
; Copy W to TEMP register,
SWAPF
STATUS, W
; Swap status to be saved into W
MOVWF
STATUS_TEMP
; Save status to STATUS_TEMP register
ISR
:
; Interrupt Service Routine
:
;
should configure Bank as required
:
;
POP
SWAPF
STATUS_TEMP, W
; Swap nibbles in STATUS_TEMP register
; and place result into W
MOVWF
STATUS
; Move W into STATUS register
;
(sets bank to original state)
SWAPF
W_TEMP, F
; Swap nibbles in W_TEMP and place result in W_TEMP
SWAPF
W_TEMP, W
; Swap nibbles in W_TEMP and place result into W
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