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UPD784938 Datasheet(PDF) 56 Page - NEC |
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UPD784938 Datasheet(HTML) 56 Page - NEC |
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56 / 733 page  CHAPTER 2 PIN FUNCTIONS 56 Preliminary User’s Manual U13987EJ1V0UM00 (3) P20 to P27 (Port 2) ... Input Port 2 is an 8-bit input-only port. P22 to P27 incorporate a software programmable pull-up resistor. As well as operating as an input port, port 2 pins also operate as control signal input pins, such as external interrupt signal pins (see Table 2-2). All 8 pins are Schmitt-triggered inputs to prevent misoperation due to noise. Also, pin P25 can also be made to function as a serial clock output pin by selecting the external clock as “serial operation enabled” with the clocked serial interface mode register 1 (CSIM1). Table 2-2. Port 2 Operation Modes Port Function P20 Input port/NMI inputNote P21 Input port/INTP0 input/CR11 capture trigger input/ timer/event counter 1 count clock/real-time output port trigger signal P22 Input port/INTP1 input/CR22 capture trigger input P23 Input port/INTP2 input/CI input P24 Input port/INTP3 input/CR02 capture trigger input/ timer/event counter 0 count clock P25 Input port/INTP4 input/ASCK input/SCK1 input/output P26 Input port/INTP5 input/A/D converter external trigger input P27 Input port/SI0 input Note NMI input is acknowledged regardless of whether interrupts are enabled or disabled. (a) Function as port pins The pin level can always be read or tested regardless of the alternate function pin operation. (b) Functions as control signal input pins (i) NMI (Non-maskable Interrupt) The external non-maskable interrupt request input pin. Rising edge detection or falling edge detection can be specified by setting the external interrupt mode register 0 (INTM0). (ii) INTP0 to INTP5 (Interrupt from Peripherals) External interrupt request input pins. When the valid edge specified by the external interrupt mode register 0, 1 (INTM0/INTM1) is detected by pins INTP0 to INTP5, an interrupt is generated (see CHAPTER 22 EDGE DETECTION FUNCTION). In addition, pins INTP0 to INTP3 and INTP5 are also used as external trigger input pins with the various functions shown below. • INTP0 ....... Timer/event counter 1 capture trigger input pin Timer/event counter 1 external count clock input pin Real-time output port trigger input pin • INTP1 ....... Timer/event counter 2 capture trigger input pin to capture register (CR22) • INTP2 ....... Timer/event counter 2 external count clock input pin Capture trigger input pin to capture/compare register (CR21) • INTP3 ....... Timer/event counter 0 capture trigger input pin Timer/event counter 0 external count clock input pin • INTP5 ....... A/D converter external trigger input pin |
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