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UPD17704GC Datasheet(PDF) 21 Page - NEC

No. de pieza UPD17704GC
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17704GC Datasheet(HTML) 21 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
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/SCK0
P0A0/SO0
P0B3/SI0
P0B2/SCK1
P0B1/SO1
P0B0/SI1
P0C3-P0C0
P1D3
P1D2
P1D1/BEEP1
P1D0/BEEP0
P2A2
P2A1/FCG1
P2A0/FCG0
P2B3-P2B0
P2C3-P2C0
P2D2-P2D0
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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