D17133CS datasheet(164/289 Pages) NEC

164 / 289 page

CHAPTER 14

INTERRUPT FUNCTIONS

149

Figure 14-1. Interrupt Control Register (2/4)

RF: 3FH

Read/write

Initial value when reset

Bit 3

Bit 2

Bit 1

Bit 0

IRQ

R/W

Read=R, write=W

IRQ

INT Pin Interrupt Request (at Reading)

No interrupt request has been issued from the INT

pin or an INT pin interrupt is being handled.

An interrupt request from the INT pin occurs or an

INT pin interrupt is being held.

IRQ

INT Pin Interrupt Request (at Writing)

An interrupt request from the INT pin is forcibly

released.

An interrupt request from the INT pin is forced to

occur.

RF: 3FH

Read/write

Initial value when reset

Bit 3

Bit 2

Bit 1

Bit 0

IRQTM

R/W

Read=R, write=W

IRQTM

TM Interrupt Request (at Reading)

No interrupt request has been issued from

timer or a timer interrupt is being handled.

The contents of the timer count register matches

that of the timer modulo register and an interrupt

request occurs. Or a timer interrupt request is

being held.

IRQTM

TM Interrupt Request (at Writing)

An interrupt request from timer is forcibly released.

An interrupt request from timer is forced to occur.

Remark

If TMRES is set to 1, IRQTM is cleared to 0.

IRQTM is cleared to 0 immediately after STOP

instruction is executed.

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