ST90T158 datasheet(51/190 Pages) STMICROELECTRONICS

No de pièce	ST90T158

Description	8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

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ST90158 - 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 21) 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 21. 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

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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