參數(shù)資料
型號: MC80F0208Q
廠商: Electronic Theatre Controls, Inc.
元件分類: 8位微控制器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 95/128頁
文件大?。?/td> 1408K
代理商: MC80F0208Q
Preliminary
MC80F0208/16/24
MAR. 2005 Ver 0.2
91
processing step is determined by IFR as shown in Figure 19-6.
Figure 19-6 Software Flowchart of Shared Interrupt Vector
19.4 Multi Interrupt
If two requests of different priority levels are received simulta-
neously, the request of higher priority level is serviced. If re-
quests of the interrupt are received at the same time
simultaneously, an internal polling sequence determines by hard-
ware which request is serviced. However, multiple processing
through software for special features is possible. Generally when
an interrupt is accepted, the I-flag is cleared to disable any further
interrupt. But as user sets I-flag in interrupt routine, some further
interrupt can be serviced even if certain interrupt is in progress.
Figure 19-7 Execution of Multi Interrupt
WDTIF
WDT Interrupt
Routine
WDT or WT
Interrupt Request
=0
=1
Clear WDTIF
WTIF
WDT Interrupt
Routine
RETI
=0
=1
Clear WTIF
Tx0IOF(Tx1IOF)
Tx0(Tx1) Interrupt
Routine
UART0(UART1)
Interrupt Request
=0
=1
Clear Tx0IOF(Tx1IOF)
Rx0IOF(Rx1IOF)
Rx0(Rx1) Interrupt
Routine
RETI
=0
=1
Clear Rx0IOF(Rx1IOF)
enable INT0
disable other
TIMER 1
service
INT0
service
Main Program
service
Occur
TIMER1 interrupt
Occur
INT0
EI
enable INT0
enable other
In this example, the INT0 interrupt can be serviced without any
pending, even TIMER1 is in progress.
Because of re-setting the interrupt enable registers IENH,IENL
and master enable “EI” in the TIMER1 routine.
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