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ST90135M6 参数 Datasheet PDF下载

ST90135M6图片预览
型号: ST90135M6
PDF下载: 下载PDF文件 查看货源
内容描述: 8月16号位微控制器( MCU ), 16至64K的ROM 。 OTP或EPROM 。 512 2K的RAM - ST9 +系列\n [8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY ]
分类和应用: 微控制器可编程只读存储器电动程控只读存储器
文件页数/大小: 199 页 / 2805 K
品牌: ETC [ ETC ]
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ST90158 - INTERRUPTS  
ARBITRATION MODES (Cont’d)  
Examples  
Example 1  
In the following two examples, three interrupt re-  
quests with different priority levels (2, 3 & 4) occur  
simultaneously during the interrupt 5 service rou-  
tine.  
In the first example, (simplest case, Figure 21) the  
eiinstruction is not used within the interrupt serv-  
ice routines. This means that no new interrupt can  
be serviced in the middle of the current one. The  
interrupt routines will thus be serviced one after  
another, in the order of their priority, until the main  
program eventually resumes.  
Figure 21. Simple Example of a Sequence of Interrupt Requests with:  
- Concurrent mode selected and  
- IEN unchanged by the interrupt routines  
INTERRUPT 2 HAS PRIORITY LEVEL 2  
INTERRUPT 3 HAS PRIORITY LEVEL 3  
INTERRUPT 4 HAS PRIORITY LEVEL 4  
INTERRUPT 5 HAS PRIORITY LEVEL 5  
0
1
2
3
4
5
6
7
Priority Level of  
Interrupt Request  
INT 2  
CPL = 7  
INT 3  
CPL = 7  
INT 2  
INT 3  
INT 4  
INT 4  
CPL = 7  
INT 5  
CPL = 7  
ei  
INT 5  
MAIN  
MAIN  
CPL = 7  
CPL is set to 7  
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