7721 datasheet(126/577 Pages) RENESAS

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TIMER A

7721 Group User’s Manual

8–7

8.2 Block description

8.2.4 Timer Ai interrupt control register

Figure 8.2.4 shows the structure of the timer Ai interrupt control register. For details about interrupts, refer

to “CHAPTER 7. INTERRUPTS.”

Fig. 8.2.4 Structure of timer Ai interrupt control register

(1)

Interrupt priority level select bits (bits 2 to 0)

These bits select a timer Ai interrupt’s priority level. When using timer Ai interrupts, select one of the

priority levels (1 to 7). When a timer Ai interrupt request occurs, its priority level is compared with

the processor interrupt priority level (IPL). The requested interrupt is enabled only when its priority

level is higher than the IPL. (However, this applies when the interrupt disable flag (I) = “0.”) To

disable timer Ai interrupts, set these bits to “0002” (level 0).

(2)

Interrupt request bit (bit 3)

This bit is set to “1” when a timer Ai interrupt request occurs. This bit is automatically cleared to “0”

when the timer Ai interrupt request is accepted. This bit can be set to “1” or cleared to “0” by

software.

Timer Ai interrupt control register (i = 0 to 4) (Addresses 7516 to 7916)

Bit

7 to 4

Interrupt request bit

Bit name

At reset

Functions

0 0 0 : Level 0 (Interrupt 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 requested

1 : Interrupt requested

Interrupt priority level

select bits

–

Undefined

Nothing is assigned.

Low level

High level

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