UPD75316BGC datasheet(29/77 Pages) NEC

29 / 77 page

µPD75312B, 75316B

INTERRUPT FUNCTION

The

µPD75316B has six interrupt sources which enable multiple interrupt by software control. It also has two

test sources, of which the INT2 has two edge detection testable inputs.

Table 6-1. Types of Interrupt Sources

Vectored interrupt request

signal (vector table address)

INTBT

(standard interval signal from basic

interval timer)

VRQ1 (0002H)

INT4

(both rising and falling edge

detection are valid.)

INT0

(Rising or falling detection edge is

External

VRQ2 (0004H)

selected.)

INT1

External

VRQ3 (0006H)

INTCSI (serial data transfer end signal)

Internal

VRQ4 (0008H)

INTT0

(match signal between the count

Internal

VRQ5 (000AH)

programmable timer/counter)

INT2Note 2 (rising edge detection of input to

INT2 pin or falling edge detection of

External

input to KR0-KR7)

Testable input signal (IRQ2 and IRWQ are set.)

INTWNote 2 (signal from clock timer)

Internal

Notes

Interrupt priority is serviced according to the order of priority, when several interrupt requests are

generated simultaneously.

Test source. They are affected by the interrupt enable flag in the same way as the interrupt source,

but no vectored interrupt is generated.

The

µPD75316B interrupt control circuit has the following functions:

• Hardware control vectored interrupt function that can control interrupt acknowledgement by interrupt flag

(IE

×××) and interrupt master enable flag (IME).

• Interrupt start address can be set.

• Interrupt request flag (IRQ

×××) test function (interrupt generation confirmation by software possible).

• Standby mode release (selection of interrupt that releases the standby mode by interrupt enable flag possible).

Internal/external

Interrupt priorityNote 1

Interrupt sources

Internal

External

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