PD17P709A_15 Datasheet, PDF (21/38 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

µPD17P709A
1.4 Connections of Unused Pins
It is recommended to connect unused pins as follows.
Port pin
Pin Name
Table 1-1. Connections of Unused Pins
I/O Mode
Recommended Connection
(1/2)
P0D3/AD3 to P0D0/AD0 Input
Independently connect to GND via a resistor^{Note 1}.
P1C3/AD5
P1C2/AD4
P1C1/AMIFC^{Note 2}
P1C0/FMIFC^{Note 2}
Set to port mode and individually connect to VDD or GND
via a resistor^{Note 1}.
P1A3/INT4
Independently connect to GND via a resistor^{Note 1}.
P1A2/INT3
P1A1
P1A0/TM0G
P1B3
N-ch open-drain
Set to low-level output by software and leave open.
P1B2/PWM2 to P1B0/PWM0 output
P0A3/SDA
I/O^{Note 3}
Set to general-purpose input port mode by software and
P0A2/SCL
independently connect to VDD or GND via a resistor^{Note 1}.
P0A1/SCK0
P0A0/SO0
P0B3/SI0
P0B2/SCK1
P0B1/SO1
P0B0/SI1
P0C3 to P0C0
P1D3
P1D2
P1D1/BEEP1
P1D0/BEEP0
P2A2
P2A1/FCG1
P2A0/FCG0
P2B3 to P2B0
P2C3 to P2C0
P2D2 to P2D0
Notes 1. If a pin is externally pulled up (connected to VDD via a resistor) or pulled down (connected to GND
via a 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 kΩ, although 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 input port mode at power-on reset, when reset by the
RESET pin, or when reset by an overflow or underflow of the watchdog timer or the stack.
Data Sheet U15723EJ1V0DS
19