HD6433937 Datasheet, PDF (190/521 Pages) Hitachi Semiconductor – Hardware Manual

Bit 1: TXD₃₁ pin output data inversion switch
Bit 1 specifies whether or not TXD₃₁ pin output data is to be inverted.
Bit 1
SCINV1
0
1
Description
TXD₃₁ output data is not inverted
TXD₃₁ output data is inverted
Bit 0: RXD₃₁ pin input data inversion switch
Bit 0 specifies whether or not RXD₃₁ pin input data is to be inverted.
Bit 0
SCINV0
0
1
Description
RXD₃₁ input data is not inverted
RXD₃₁ input data is inverted
(initial value)
(initial value)
8.13.3 Note on Modification of Serial Port Control Register
When a serial port control register is modified, the data being input or output up to that point is
inverted immediately after the modification, and an invalid data change is input or output. When
modifying a serial port control register, do so in a state in which data changes are invalidated
8.14 Application Note
8.14.1 The Management of the Un-Use Terminal
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 V_CC with an on-chip pull-up MOS.
 Pull it up to V_CC with an external resister of approximately 100 kΩ.
 Pull it down to V_SS with an external resister 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 V_CC with an on-chip pull-up MOS.
 Set the output of the unused pin to high and pull it up to V_CC with an external resister of
approximately 100 kΩ.
 Set the output of the unused pin to low and pull it down to V_SS with an external resister of
approximately 100 kΩ.
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