uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
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2.1 List of Pin Functions<br />
24<br />
(1) Port pins<br />
CHAPTER 2 PIN FUNCTIONS<br />
Pin Name I/O Function After Reset Alternate Function<br />
P00 to P07 I/O Port 0.<br />
8-bit I/O port.<br />
Input/output can be specified in 1-bit units.<br />
When used as an input port, an on-chip pull-up<br />
resistor can be specified by means of pull-up resistor<br />
option register 0 (PU0).<br />
Input —<br />
P10 to P12 I/O Port 1.<br />
3-bit I/O port.<br />
Input/output can be specified in 1-bit units.<br />
When used as an input port, an on-chip pull-up<br />
resistor can be specified by means of pull-up resistor<br />
option register 0 (PU0).<br />
Input —<br />
P20 I/O Port 2.<br />
Input SCK10<br />
P21 6-bit I/O port.<br />
SO10<br />
P22<br />
Input/output can be specified in 1-bit units.<br />
When used as an input port, an on-chip pull-up<br />
SI10<br />
P23 resistor can be specified by means of pull-up resistor<br />
INTP0<br />
P24 option register B2 (PUB2).<br />
INTP1<br />
P25 TI<br />
P80 to P87 I/O Port 8.<br />
P-ch open-drain 8-bit high-tolerance I/O port.<br />
For mask ROM versions, use of a pull-down resistor<br />
for VLOAD can be specified in 1-bit units by a mask<br />
option (when used as a general-purpose I/O port, the<br />
pull-down resistor is connected to VSS0).<br />
Output FIP24 to FIP17<br />
P90 to P97 Output Port 9<br />
P-ch open-drain 8-bit high-tolerance output port.<br />
Mask ROM versions include an on-chip pull-down<br />
resistor (connected to VLOAD).<br />
Output FIP16 to FIP9<br />
Preliminary User’s Manual U14938EJ1V0UM
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