7733 datasheet(109/940 Pages) RENESAS

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KEY INPUT INTERRUPT FUNCTION

7733 Group User’s Manual

5–6

INT2

/key input interrupt control register (address 7F 16)

Bit

Must be fixed to “0.”

Interrupt request bit

Interrupt priority level selection

bits

Bit name

At reset

Undefined

Functions

0 0 0: Level 0 (Interrupt is disabled.)

0 0 1: Level 1

0 1 0: Level 2

0 1 1: Level 3

1 0 0: Level 4

1 0 1: Level 5

1 1 0: Level 6

1 1 1: Level 7

b2 b1 b0

0: No interrupt request has occurred.

1: Interrupt request has occurred.

Not implemented.

Undefined

–

5.2.3 Interrupt function

____

The key input interrupt and the INT2 interrupt share the same interrupt vector addresses and interrupt

____

control register. Specify addresses FFF016 and FFF116 (in other words, the vector addresses for the INT2/

____

key input interrupt) as the interrupt vector addresses; specify the INT2/key input interrupt control register

____

(address 7F16) as the interrupt control register. Figure 5.2.4 shows the structure of the INT2/key input

interrupt control register when the key input interrupt function is selected.

____

The operation at accepting a key input interrupt request is the same as that at accepting an INT2 interrupt

request.

5.2 Block description

____

Fig. 5.2.4 Structure of INT2/key input interrupt control register when key input interrupt function is selected

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