NEC PD750008 - Manual (Page 232)

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µPD750008 USER'S MANUAL
Figure 6-10. Block Diagram of the INT2 and KR0 to KR7 Circuits
INT2/P12 KR7/P73 KR6/P72 KR5/P71 KR4/P70 KR3/P63 KR2/P62 KR1/P61 KR0/P60
IM2
4
Input buffer
Internal bus
Selector
Rising edge detection circuit Falling edge detection circuit
INT2 (IRQ2 set signal)
IM20, IM21