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| 型號(hào)： | HMS99C54S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| 中文描述： | 8位單片機(jī)與嵌入式閃存微控制器 |
| 文件頁(yè)數(shù)： | 29/73頁(yè) |
| 文件大?。?/td> | 696K |
| 代理商： | HMS99C54S |
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HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
25
A low-priority interrupt can itself be interrupted by a high-priority interrupt, but not by another low priority in-
terrupt. 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 re-
quest is serviced. Thus within each priority level there is a second priority structure determined by the polling
sequence as shown in Table 9.
Source (Request Flags)
Vectors
Vector Address
RESET
IE0
TF0
IE1
TF1
RI
+
TI
TF2
+
EXF2
RESET
External interrupt 0
Timer 0 interrupt
External interrupt 1
Timer 1 interrupt
Serial port interrupt
Timer 2 interrupt
0000
H
0003
H
000B
H
0013
H
001B
H
0023
H
002B
H
Table 8. Interrupt Sources and their Corresponding Interrupt Vectors
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 + TI
TF2 + EXF2
High
↓
↓
↓
↓
Low
Table 9. Interrupt Priority-Within-Level
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