NEC PD17062 Instrukcja Użytkownika Pobierz pdf (Strona 150)

150

PD17062

Fig. 12-9 Timer Interrupt Error (2/2)

(b) When the timer interrupt pulse is switched

EI EI EI EI

IRQBTM0

IPBTM0

INTE

Internal pulse A

Internal pulse B

Timer interrupt pulse

Interrupt accepted

Timer interrupt

pulse switched

Interrupt accepted

Timer interrupt

pulse switched

Interrupt accepted

Although the timer interrupt pulse is switched to B at , no interrupt occurs because the timer interrupt

pulse does not go low. Therefore, an interrupt occurs when the interrupt pulse goes low at point .

When the timer interrupt pulse is switched to A at point , the timer interrupt pulse goes low, and the

interrupt request is accepted immediately.

EI EI EI

IRQBTM0

IPBTM0

INTE

Timer interrupt pulse

Interrupt accepted

SET1 IRQBTM0

Interrupt accepted

CLR1 IRQBTM0

No interrupt accepted Interrupt accepted

When the IRQBTM0 flag is set at point , an interrupt request is accepted immediately.

If the IRQBTM0 flag is reset at the same time the timer interrupt pulse goes low at point , the interrupt request

is not accepted.

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NEC PD17062 Instrukcja Użytkownika Strona 150