UPD17717GC datasheet(21/408 Pages) NEC

21 / 408 page

µPD17717, 17718, 17719

1.3 Connections of Unused Pins

It is recommended to connect unused pins as follows:

Table 1-1. Connections of Unused Pins (1/2)

Pin Name

I/O Mode

Recommended Connections of Unused Pins

Port pin

P0D3/AD3-P0D0/AD0

Input

Individually connect to GND via resistorNote 1.

P1C3/AD5

P1C2/AD4

P1C1/AMIFCNote 2

Set in port mode and individually connect to VDD or GND

P1C0/FMIFCNote 2

via resistorNote 1.

P1A3/INT4

Individually connect to GND via resistorNote 1.

P1A2/INT3

P1A1

P1A0/TM0G

P1B3

N-ch open-drain

Set to low-level output by software and then open.

P1B2/PWM2-P1B0/PWM0

output

P0A3/SDA

I/ONote 3

Set in general-purpose input port mode by software and

P0A2/SCL

individually connect to VDD or GND via resistorNote 1.

P0A1/SCK2

P0A0/SO2

P0B3/SI2

P0B2/SCK3

P0B1/SO3/TxD

P0B0/SI3/RxD

P0C3-P0C0

P1D3

P1D2

P1D1/BEEP1

P1D0/BEEP0

P2A2

P2A1/FCG1

P2A0/FCG0

P2B3-P2B0

P2C3-P2C0

P2D2/SCK

P2D1/SB1

P2D0/SB0

Notes 1. If a pin is externally pulled up (connected to VDD via resistor) or pulled down (connected to GND

via resistor) with a high resistance, the pin almost enters a high-impedance state, increasing the

current (through-current) consumption of the port. Generally, the resistance of a pull-up or pull-

down resistor is several 10 k

Ω, though it depends on the application circuit.

2. Do not set these pins as AMIFC and FMIFC pins; otherwise, the current consumption will increase.

3. The I/O ports are set in the general-purpose I/O port mode at power-ON reset, when reset by the

RESET pin, or when reset due to overflow or underflow of the watchdog timer or the stack.

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