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ST92F120 Fiches technique(PDF) 75 Page - STMicroelectronics

No de pièce ST92F120
Description  8/16-BIT FLASH MCU FAMILY WITH RAM, EEPROM AND J1850 BLPD
PDF  320 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92F120 Fiches technique(HTML) 75 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 34) 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 34. 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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