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ST92F120 데이터시트(PDF) 70 Page - STMicroelectronics

부품명 ST92F120
상세설명  8/16-BIT FLASH MCU FAMILY WITH RAM, EEPROM AND J1850 BLPD
PDF  324 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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ST92F120 데이터시트(HTML) 70 Page - STMicroelectronics

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ST92F120 - INTERRUPTS
ARBITRATION MODES (Cont’d)
re-enabled, they will be acknowledged regardless
of the interrupt service routine’s priority. This may
cause undesirable interrupt response sequences.
Examples
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.
Example 1
In the first example, (simplest case, Figure 32) the
ei
instruction 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 32. Simple Example of a Sequence of Interrupt Requests with:
- Concurrent mode selected and
- IEN unchanged by the interrupt routines
6
5
4
3
2
1
0
7
Priority Level of
MAIN
INT 5
INT 2
INT 3
INT 4
MAIN
INT 5
INT 4
INT 3
INT 2
CPL is set to 7
CPL = 7
CPL = 7
CPL = 7
CPL = 7
CPL = 7
ei
INTERRUPT 2 HAS PRIORITY LEVEL 2
INTERRUPT 3 HAS PRIORITY LEVEL 3
INTERRUPT 4 HAS PRIORITY LEVEL 4
INTERRUPT 5 HAS PRIORITY LEVEL 5
Interrupt Request
9



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