HD64F38602R Datasheet, PDF (176/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 8 I/O Ports
8.7 Usage Notes
8.7.1 How to Handle Unused Pin
If an I/O pin not used by the user system is floating, pull it up or down.
• If an unused pin is an input pin, handle it in one of the following ways:
 Pull it up to Vcc with an on-chip pull-up MOS.
 Pull it up to Vcc with an external resistor of approximately 100 kΩ.
 Pull it down to Vss with an external resistor of approximately 100 kΩ.
 For a pin also used by the A/D converter, pull it up to AVcc with an external resistor of
approximately 100 kΩ.
• If an unused pin is an output pin, handle it in one of the following ways:
 Set the output of the unused pin to high and pull it up to Vcc with an external resistor of
approximately 100 kΩ.
 Set the output of the unused pin to low and pull it down to GND with an external resistor of
approximately 100 kΩ.
8.7.2 Input Characteristics Difference due to Pin Function
When the functions of pins IRQ0, IRQ1, IRQAEC, AEVL, AEVH, SCK3, FTIOA to FTIOD,
FTCI, SSCK, SCS, SDA, and SCL are selected, the corresponding pins have the schmitt-trigger
input characteristics, which are different from the ones when they are used as the port input pins.
For example, the input high voltage and the input low voltage of the PB0/AN0/IRQ0 pin differ
when the pin is used as PB0 input or IRQ0 input. For details, refer to table 21.2 which lists the DC
characteristics for F-ZTAT version, and table 21.13 which lists the DC characteristics for masked
ROM version.
Rev. 3.00 May 15, 2007 Page 144 of 516
REJ09B0152-0300