参数资料
型号: KSZ8851-16MQL
厂商: Micrel Inc
文件页数: 45/88页
文件大小: 0K
描述: IC CTLR MAC/PHY NON-PCI 128-PQFP
产品培训模块: KSZ8851 10/100 Embedded Controllers
标准包装: 66
控制器类型: 以太网控制器,MAC/PHY
接口: 总线
电源电压: 1.8V,2.5V,3.3V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 128-BFQFP
供应商设备封装: 128-PQFP(14x20)
包装: 托盘
产品目录页面: 1081 (CN2011-ZH PDF)
配用: 576-3292-ND - BOARD EVALUATION KSZ8851-16MLL
其它名称: 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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