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UPD784938 Datasheet(PDF) 54 Page - NEC |
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UPD784938 Datasheet(HTML) 54 Page - NEC |
54 / 733 page ![]() CHAPTER 2 PIN FUNCTIONS 54 Preliminary User’s Manual U13987EJ1V0UM00 (2) Non-port pins (2/2) Pin Name Input/Output Alternate Function Function ASTB Output CLKOUT Time division address (A0 to A7) latch timing output (during external memory access) CLKOUT Output ASTB Clock output PWM0 Output — PWM output 0 PWM1 Output — PWM output 1 RX Input — Data input (IEBus) TX Output — Data output (IEBus) REGC — — Connection of capacitor for regulator output stabilization/power supply when regulator stops REGOFF — — Regulator operation specification signal RESET Input — Chip reset X1 Input — System clock oscillation crystal connections X2 — (clock can also be input to X1) XT1 Input — Watch clock connection XT2 — — ANI0 to ANI7 Input P70 to P77 A/D converter analog voltage inputs AVREF1 — — A/D converter reference voltage application AVDD A/D converter positive power supply AVSS A/D converter GND VDD Positive power supply VSS GND IC Input VPP Internally connected. Connect directly to VSS (IC test pin). VPP IC Flash memory programming mode setting. High voltage application during program write/verify. Connect directly to VSS in normal operating mode. |
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