參數(shù)資料
型號: SAB-C502-L20P
廠商: SIEMENS A G
元件分類: 微控制器/微處理器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8-BIT, 10 MHz, MICROCONTROLLER, PDIP40
文件頁數(shù): 27/46頁
文件大?。?/td> 567K
代理商: SAB-C502-L20P
Semiconductor Group
26
C502
Table 11
Interrupt Sources and their Corresponding Interrupt Vectors
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 12
.
Table 12
Interrupt Priority-within-Level
Source (Request Flags)
Vector
Vector Address
IE0
TF0
IE1
TF1
RI + TI
TF2 + EXF2
External interrupt 0
Timer 0 interrupt
External interrupt 1
Timer 1 interrupt
Serial port interrupt
Timer 2 interrupt
0003H
000BH
0013H
001BH
0023H
002BH
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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