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2.3 Description of Pin Functions
(1) P00 to P07 (Port 0) ... Input
Port 0 is an 8-bit input-only port in which all pins are fixed for input.
Besides functioning as an input port, in control mode, P00 to P07 operate as NMI input, real-time pulse unit
(RPU) output stop signal input, external interrupt request input, and A/D converter (ADC) external trigger
input. Normally, if function pins also serve as ports, one mode or the other is selected using a port mode
control register. However, there is no such register for P00 to P07. Therefore, the input port cannot be
switched with the NMI input pin, RPU output stop signal input pin, external interrupt request input pin, and
A/D converter (ADC) external trigger input pin. Read the status of each pin by reading the port.
(a) Port mode
P00 to P07 are input-only.
(b) Control mode
P00 to P07 also serve as NMI, ESO0, ESO1, ADTRG0, ADTRG1, and INTP0 to INTP6 pins, but they
cannot be switched.
(i) NMI (Non-maskable interrupt request) ... Input
This is non-maskable interrupt request input.
(ii) ESO0, ESO1 (Emergency shut off) ... Input
These pins input timer 00 and timer 01 output stop signals.
(iii) INTP0 to INTP6 (Interrupt request from peripherals) ... Input
These are external interrupt request input pins.
(iv) ADTRG0, ADTRG1 (A/D trigger input) ... Input
These are A/D converter external trigger input pins.
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CHAPTER 2 PIN FUNCTIONS
User's Manual U14492EJ3V0UD
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