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UPD784938 Datasheet(PDF) 63 Page - NEC |
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UPD784938 Datasheet(HTML) 63 Page - NEC |
63 / 733 page ![]() CHAPTER 2 PIN FUNCTIONS 63 Preliminary User’s Manual U13987EJ1V0UM00 Table 2-5. Pin Input/Output Circuit Types and Recommended Connection of Unused Pins (2/2) Pin Name Input/Output Input/Output Recommended Connection Circuit Type of Unused Pins P70/ANI0 to P77/ANI7 20 Input/output Input: Connect to VDD or VSS P90 to P97 5-A Output: Leave open P100 to P104 P105/SCK3 10-A P106/SI3 8-A P107/SO3 10-A ASTB/CLKOUT 4 Output Leave open RESET 2 Input — IC/VPPNote 1 Directly connect to VSS XT2 — — Leave open XT1 — Input Connect to VSS REGOFF 1 Connect to VDD REGC — — PWM0, PWM1 3 Output Leave open RX 2 Input Connect to VDD or VSS TX 3 Output Leave open AVREF1 — Input Connect to VSS AVSS AVDD Connect to VDD Note The VPP pin is used only in the µPD78F4938. Caution If the input/output mode is undefined for an input/output alternate-function pin, it should be connected to VDD via a resistor of several tens of k Ω (especially when the reset input pin goes to the low-level input voltage or over upon powering on, and when input/output is switched by software.) Remark The type numbers are standard for the 78K Series, and therefore are not necessarily serial numbers within each product (there are non-incorporated circuits). |
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