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參數(shù)資料
| 型號： | Q67127-C2036SAB-C161R1-L16M |
| 英文描述： | IC-SM-16 BIT CPU |
| 中文描述： | 集成電路的Sm - 16位CPU |
| 文件頁數(shù)： | 89/121頁 |
| 文件大?。?/td> | 1000K |
| 代理商： | Q67127-C2036SAB-C161R1-L16M |
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Interrupt System
C501
Semiconductor Group
7-11
7.5
Interrupt Response Time
If an external interrupt is recognized, its corresponding request flag is set at S5P2 in every machine
cycle. The value is not polled by the circuitry until the next machine cycle. If the request is active and
conditions are right for it to be acknowledged, a hardware subroutine call to the requested service
routine will be next instruction to be executed. The call itself takes two cycles. Thus a minimum of
three complete machine cycles will elapse between activation and external interrupt request and the
beginning of execution of the first instruction of the service routine.
A longer response time would be obtained if the request was blocked by one of the three previously
listed conditions. If an interrupt of equal or higer priority is already in progress, the additional wait
time obviously depends on the nature of the other interrupt’s service routine. If the instruction in
progress is not in its final cycle, the additional wait time cannot be more than 3 cycles since the
longest instructions (MUL and DIV) are only 4 cycles long; and, if the instruction in progress is RETI
or a write access to registers IE or IP the additional wait time cannot be more than 5 cycles (a
maximum of one more cycle to complete the instruction in progress, plus 4 cycles to complete the
next instruction, if the instruction is MUL or DIV).
Thus a single interrupt system, the response time is always more than 3 cycles and less than
9 cycles.
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