UPD78P9014 datasheet(13/50 Pages) RENESAS

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µPD78P9014

4.3 Pin I/O Circuit and Unused Pin Connections

Table 4-1 shows the types of the I/O circuits of each pin and the connections for unused pins.

See Figure 4-1 for the structure of each type of I/O circuit.

Table 4-1. Types of Pin I/O Circuits

Pin Name

I/O Circuit Type

I/O

Recommended Connection for Unused Pin

P00-P07

5-A

I/O

Connect to VDD or VSS through a separate resistor.

P10-P17

P20/ASCK/SCK0

5-D

P21/TxD/SO0

5-A

P22/RxD/SI0

5-D

P30/INTP0/TI0/TO0

Connect to VSS through a separate resistor.

P31/INTP1/TI1/TO1

P32/INTP2

RESET

–

VPP

–

Connect directly to VSS.

Figure 4-1. Summary of the Pin I/O Circuits

Schmitt-Triggered Input with hysteresis characteristics

Type 2

Type 5-A

Type 5-D

VDD

P-ch

VDD

P-ch

N-ch

IN/OUT

pullup

enable

data

output

disable

input

enable

VDD

P-ch

VDD

P-ch

N-ch

IN/OUT

pullup

enable

data

output

disable

input

enable

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