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參數資料
型號: Q67120-C508
英文描述: IC-SM-8-BIT CPU 12-MHZ
中文描述: 集成電路釤8位CPU的12兆赫
文件頁數: 85/121頁
文件大?。?/td> 1000K
代理商: Q67120-C508
Interrupt System
C501
Semiconductor Group
7-7
7.2
Interrupt Priority Level Structure
A low-priority interrupt can itself be interrupted by a high-priority interrupt, but not by another low-
priority interrupt. A high-priority interrupt cannot be interrupted by any other interrupt source.
If two requests of different priority level are received simultaneously, the request of higher priority is
serviced. If requests of the same priority are received simultaneously, an internal polling sequence
determines which request is serviced. Thus within each priority level there is a second priority
structure determined by the polling sequence as shown in
table 7-8
below:
Table 7-8
Priority-within-Level Structure
Interrupt Source
Priority
External Interrupt 0,
Timer 0 Interrupt,
External Interrupt 1,
Timer 1 Interrupt,
Serial Channel,
Timer 2 Interrupt,
IE0
TF0
IE1
TF1
RI or TI
TF2 or EXF2
High
Low
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