7733 datasheet(100/940 Pages) RENESAS

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7733 Group User's Manual

4–21

INTERRUPTS

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4.10.1 INTi interrupt request bit’s function

(1) Functions when edge sense is selected

By clearing the level sense/edge sense selection bit to “0,” the edge sense is selected. (Refer to

Figure 4.10.3.)

The interrupt request bit has the same functions as those for the interrupt request bit of internal

interrupts.

When an interrupt occurs, the interrupt request bit is set to “1” and retains this state until the interrupt

request is accepted.

When the interrupt request bit is cleared to “0” by software, an interrupt request is cancelled; when

the interrupt request bit is set to “1” by software, an interrupt request can be generated.

(2) Functions when level sense is selected

By setting the level sense/edge sense selection bit to “1,” the level sense is selected. (Refer to Figure

4.10.3.)

____

The interrupt request bit is ignored. In this case, interrupt requests occur sequentially while pin INTi

____

is at the valid levelV1; when pin INTi’s level changes to the invalid levelV2 with the interrupt request not

accepted, the interrupt request is not held. (Refer to Figure 4.10.4.)

Valid levelV1: The level selected by the polarity selection bit (bit 4 at addresses 7D16 to 7F16)

Invalid levelV2: The reverse level to “valid level”

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4.10 External interrupts (INTi interrupt)

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Fig. 4.10.3 INTi Interrupt request

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Fig. 4.10.4 Re-occurrence of INTi interrupt request when level sense is selected

Pin INTi

Edge detection

circuit

Interrupt

request

Level sense/Edge sense

selection bit

“0”

“1”

Data bus

Interrupt request bit

Level sense

Edge sense

1st interrupt routine

Pin INTi

’s level

Valid

Invalid

Main routine

Interrupt request is accepted.

Return to main routine

2nd interrupt

routine

3rd interrupt

routine

Main routine

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