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UPD17016 Datasheet(PDF) 22 Page - NEC

Part # UPD17016
Description  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17016 Datasheet(HTML) 22 Page - NEC

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µPD17016, 17017
22
1.4 Processing of Unused Pins
It is recommended that unused pins be processed as follows:
Table 1-1. Processing of Unused Pins
Pin Name
I/O Mode
Recommended Processing
Port pins
P0A0-P0A3
I/ONote 1
Set general-purpose input port mode by software, and
P0B0/SI
connect each port pin to VDD or GND via resistorNote 2.
P0B1/SO
P0B2/SCK
P0B3
P0C0-P0C3
P0D0/ADC2-P0D3/ADC5
Input
Connect each port pin to GND via resistorNote 2.
P0E0/LCD22-P0E3/LCD25
CMOS push-pull output
Open
P0F0/LCD26-P0F3/LCD29
P1A0-P1A3
I/ONote 1
Set general-purpose input port mode by software, and
connect each port pin to VDD or GND via resistorNote 2.
P1B0/BEEP
CMOS push-pull output
Open
P1B1/PWM0, P1B2/PWM1
N-ch open drain output
Set low-level output by software and leave port pins open.
P1B3
P1C0-P1C3
CMOS push-pull output
Open
P1D0/ADC0, P1D1/ADC1
Input
Connect each pin to VDD or GND via resistorNote 2.
P1D2/AMIFCNote 3
Set port mode and connect each pin to VDD or GND via
P1D3/FMIFCNote 3
resistorNote 2.
P2A0
CMOS push-pull output
Open
CE
Input
Connect to VDD via resistorNote 2.
COM0, COM1
Output
Open
EO0, EO1
Output
Open
IC0
Connect to VDD or GND via resistorNote 2.
IC1
Connect to VDD via resistorNote 2.
IC2, IC3
Open
INT0
Input
Connect to VDD or GND via resistorNote 2.
LCD0/KS0-LCD15/KS15
Output
Open
LCD16-LCD21
VCOH, VCOL
Input
Disable PLL by software and leave pins open.
Notes 1. The I/O port pins are set in the input mode on power application, execution of the clock stop instruction,
or CE reset.
2. If a port pin is externally pulled up (connect to VDD via resistor) or down (connect to GND via resistor)
with a high resistance, the pin almost goes into a high-impedance state, and the current consumption
(inrush current) of the port pin increases. Generally, the pull-up and pull-down resistances are several
10 k
Ω, although they vary depending on the application circuit.
3. Do not set these pins as AMIFC and FMIFC modes; otherwise, the current consumption will increase.
Pins
other
than port
pins


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