參數(shù)資料
型號: ATMEGA16A-PU
廠商: Atmel
文件頁數(shù): 23/88頁
文件大?。?/td> 0K
描述: MCU AVR 16K FLASH 16MHZ 40-PDIP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 10
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(8K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
配用: ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
ATSTK600-ND - DEV KIT FOR AVR/AVR32
ATSTK500-ND - PROGRAMMER AVR STARTER KIT
2009 Microchip Technology Inc.
DS41288F-page 121
PIC16F610/616/16HV610/616
12.5
Context Saving During Interrupts
During an interrupt, only the return PC value is saved
on the stack. Typically, users may wish to save key
registers during an interrupt (e.g., W and STATUS
registers). This must be implemented in software.
Temporary
holding
registers
W_TEMP
and
STATUS_TEMP should be placed in the last 16 bytes
of GPR (see Figure 2-4). These 16 locations are
common to all banks and do not require banking. This
makes context save and restore operations simpler.
The code shown in Example 12-1 can be used to:
Store the W register
Store the STATUS register
Execute the ISR code
Restore the Status (and Bank Select Bit register)
Restore the W register
EXAMPLE 12-1:
SAVING STATUS AND W REGISTERS IN RAM
Note:
The PIC16F610/616/16HV610/616 does
not require saving the PCLATH. However,
if computed GOTO’s are used in both the
ISR and the main code, the PCLATH must
be saved and restored in the ISR.
MOVWF
W_TEMP
;Copy W to TEMP register
SWAPF
STATUS,W
;Swap status to be saved into W
;Swaps are used because they do not affect the status bits
MOVWF
STATUS_TEMP
;Save status to bank zero STATUS_TEMP register
:
:(ISR)
;Insert user code here
:
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
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