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ST92196A Scheda tecnica(PDF) 47 Page - STMicroelectronics

Il numero della parte ST92196A
Spiegazioni elettronici  8/16-BIT MCU FOR TV APPLICATIONS WITH UP TO 96K ROM, ON-SCREEN-DISPLAY AND 1 OR 2 DATA SLICERS
PDF  268 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92196A Scheda tecnica(HTML) 47 Page - STMicroelectronics

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INTERRUPTS
ARBITRATION MODES (Cont’d)
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 19) 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 19. 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



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