Description Of Pin Functions - NEC V850E/PH2 User Manual

2.3 Description of Pin Functions

(1) P00 to P04 (Port 0) ... Input
Port 0 is an 8-bit input-only port in which all pins are fixed for input.
Besides functioning as a port, in control mode, P00 to P04 operate as NMI input, external interrupt
request signal, real-time pulse unit (RPU) emergency shut off signal 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 P04.
Therefore, the input port cannot be switched with the NMI input pin, external interrupt request
input pin, RPU emergency shut off signal 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 P04 are input-only.
(b) Control mode
P00 to P04 also serve as NMI, INTP0 to INTP3, ESO0, ESO1, ADTRG0, and ADTRG1 pins, but
the control function cannot be disabled.
(i) NMI (Non-maskable interrupt request) ... Input
This is non-maskable interrupt request input.
(ii) INTP0 to INTP3 (Interrupt request from peripherals) ... Input
These are external interrupt request input pins.
(iii) ESO0, ESO1 (Emergency shut off) ... Input
These pins input timer TMR0 and timer TMR1 emergency shut off signals.
(iv) ADTRG0, ADTRG1 (A/D trigger input) ... Input
These are A/D converter external trigger input pins.
Chapter 2 Pin Functions
User's Manual U16580EE3V1UD00 61