Pin Functions Of Each Port; Port 0 - NEC UPD703116 User Manual

14.3 Pin Functions of Each Port

14.3.1 Port 0

Port 0 is an 8-bit input dedicated port in which all pins are fixed for input.
7 6
P0 P07 P06
Besides functioning as an input port, in control mode, it also can operate as the timer/counter output stop signal
input, external interrupt request input, and A/D converter (ADC) external trigger input.
Although this port also serves as NMI, ESO0/INTP0, ESO1/INTP1, ADTRG0/INTP2, ADTRG1/INTP3, and INTP4
to INTP6, NMI, ESO0/INTP0, ESO1/INTP1, ADTRG0/INTP2, ADTRG1/INTP3, and INTP4 to INTP6 cannot be
switched with input port. The status of each pin is read by reading the port.
(1) Operation in control mode
Port
Port 0 P00
P01
P02
P03
P04
P05 to P07
CHAPTER 14 PORT FUNCTIONS
5 4 3
P05 P04 P03
Alternate Pin Name
NMI Non-maskable interrupt request input
ESO0/INTP0 Timer/counter output stop signal input or external
interrupt request input
ESO1/INTP1
ADTRG0/INTP2 A/D converter (ADC) external trigger input or external
interrupt request input
ADTRG1/INTP3
INTP4 to INTP6 External interrupt request input
User's Manual U14492EJ5V0UD
2 1 0
P02 P01 P00
Remarks
Address Initial value
FFFFF400H Undefined
Block Type
F
689