参数资料
型号: SAB-C515-RN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 28/162页
文件大小: 771K
代理商: SAB-C515-RN
Semiconductor Group
7-12
Interrupt System
C515
7.2
Interrupt Priority Level Structure
The following table shows the interrupt grouping of the C515 interrupt sources.
Each pair of interrupt sources can be programmed individually to one of four priority levels by setting
or clearing one bit in the special function register IP0 and one in IP1. A low-priority interrupt can be
interrupted by a high-priority interrupt, but not by another interrupt of the same or a lower priority. An
interrupt of the highest priority level cannot be interrupted by another interrupt source.
lf two or more requests of different priority leveis are received simultaneously, the request of the
highest priority is serviced first. lf requests of the same priority level are received simultaneously, an
internal polling sequence determines which request is to be serviced first. Thus, within each priority
level there is a second priority structure determined by the polling sequence, as follows.
– Within one interrupt group the left“ interrupt is serviced first
– The interrupt groups are serviced from top to bottom of the table.
Table 7-1
Interrupt Source Structure
Interrupt
Group
Associated Interrupts
Priority
1
External interrupt 0
A/D converter interrupt
High
Low
2
Timer 0 overflow
External interrupt 2
3
External interrupt 1
External interrupt 3
4
Timer 1 overflow
External interrupt 4
5
Serial channel interrupt
External interrupt 5
6
Timer 2 interrupt
External interrupt 6
High Priority
Low Priority
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