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UPD70F3114 Datasheet(PDF) 34 Page - NEC |
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UPD70F3114 Datasheet(HTML) 34 Page - NEC |
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34 / 692 page  CHAPTER 2 PIN FUNCTIONS 34 User’s Manual U15195EJ5V0UD 2.3 Description of Pin Functions (1) P00 to P05 (Port 0) … Input P00 to P05 function as a 6-bit input-only port in which all pins are fixed to input. Besides functioning as an input port, in control mode, P00 to P05 operate as NMI input, timer/counter output stop signal input, external interrupt request input, A/D converter (ADC) external trigger input, and timer 3 output stop signal input. Normally, if port pins also have alternate functions, the mode is selected using a port mode control register. However, there is no such register for P00 to P05. Therefore, the input port cannot be switched with the NMI input pin, timer/counter output stop signal input pin, external interrupt request input pin, A/D converter (ADC) external trigger input pin, and timer 3 output stop signal input pin. Read the status of each pin by reading the port. (a) Port mode P00 to P05 are input-only. (b) Control mode P00 to P05 also serve as the NMI, ESO0, ESO1, ADTRG0, ADTRG1, INTP0 to INTP4, and TO3OFF 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 INTP4 (External interrupt input) … 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. (v) TO3OFF (Timer output 3 off) … Input This is a timer output stop signal input pin. |
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