NEC PD750008 User Manual

210

µPD750008 USER'S MANUAL

6.10 TEST FUNCTION

6.10.1 Test Sources

The µPD750008 has two test sources. INT2 provides two types of edge-detection-test inputs.

Table 6-5. Test Source

Test source

Internal/external

INT2

(detection of the rising edge of the signal input to the INT2 pin or that of

External

the first falling edge of the signals input to KR0 to KR7)

INTW

(signal from clock timer)

Internal

6.10.2 Hardware to Control Test Functions

(1) Test request flags, test enable flags

Test request flags (IRQxxx) are set to 1 when the corresponding test requests (INTxxx) are issued. Clear

the test request flags to 0 with the software once the test processing has been executed.

Test enable flags (IExxx) correspond to test request flags. The test enable flags enable the standby

release signal when they are set to 1. They disables the standby release signal when they are set to 0.

When both a test request flag and the corresponding test enable flag are set to 1, the standby release

signal is generated.

Table 6-6 shows the signals which set test request flags.

Table 6-6. Signals Setting Test Request Flags

Test request flag

Signals setting test request flags

Test enable flag

IRQW

Signal from the clock timer.

IEW

IRQ2

Detection of the rising edge of INT2/P12 pin input signal or

IE2

the first falling edge of the signals input to the KR0/P60 to
KR7/P73 pins. The detection edge is selected with the INT2
edge detection mode register (IM2).