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參數資料
型號: W77E058A40PL
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝: ROHS COMPLIANT, PLASTIC, LCC-44
文件頁數: 50/87頁
文件大小: 594K
代理商: W77E058A40PL
W77E058A
- 50 -
11.2 Priority Level Structure
There are three priority levels for the interrupts, highest, high and low. The interrupt sources can be
individually set to either high or low levels. Naturally, a higher priority interrupt cannot be interrupted
by a lower priority interrupt. However there exists a pre-defined hierarchy amongst the interrupts
themselves. This hierarchy comes into play when the interrupt controller has to resolve simultaneous
requests having the same priority level. This hierarchy is defined as shown below; the interrupts are
numbered starting from the highest priority to the lowest.
Table 7. Priority structure of interrupts
SOURCE
FLAG
PRIORITY LEVEL
External Interrupt 0
IE0
1(highest)
Timer 0 Overflow
TF0
2
External Interrupt 1
IE1
3
Timer 1 Overflow
TF1
4
Serial Port
RI + TI
5
Timer 2 Overflow
TF2 + EXF2
6
Serial Port 1
RI_1 + TI_1
7
External Interrupt 2
IE2
8
External Interrupt 3
IE3
9
External Interrupt 4
IE4
10
External Interrupt 5
IE5
11
Watchdog Timer
WDIF
12 (lowest)
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