NEC PD754144 - Manual (Page 213)

CHAPTER 7 INTERRUPT AND TEST FUNCTIONS
213 User’s Manual U10676EJ3V0UM
Figure 7-10. Block Diagram of KR4 to KR7
KR7/P73
KR6/P72
KR5/P71
KR4/P70
Nothing is assigned
(in reset mode)
Key return reset circuit
Falling edge
detector
IM2
INT2
(IRQ2 setting signal)
Input buffer
4
Internal bus
Selector