HD6433935 Hitachi, HD6433935 Datasheet - Page 190

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

Bit 1: TXD
Bit 1 specifies whether or not TXD
Bit 1
SCINV1
0
1
Bit 0: RXD
Bit 0 specifies whether or not RXD
Bit 0
SCINV0
0
1
8.13.3
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
8.14.1
If an I/O pin not used by the user system is floating, pull it up or down.
178
If an unused pin is an input pin, handle it in one of the following ways:
If an unused pin is an output pin, handle it in one of the following ways:
Pull it up to V
Pull it up to V
Pull it down to V
Set the output of the unused pin to high and pull it up to V
Set the output of the unused pin to high and pull it up to V
Set the output of the unused pin to low and pull it down to V
approximately 100 k .
approximately 100 k .
Note on Modification of Serial Port Control Register
Application Note
The Management of the Un-Use Terminal
31
31
pin output data inversion switch
pin input data inversion switch
Description
TXD
TXD
Description
RXD
RXD
31
31
31
31
CC
CC
output data is not inverted
output data is inverted
input data is not inverted
input data is inverted
with an on-chip pull-up MOS.
with an external resister of approximately 100 k .
SS
with an external resister of approximately 100 k .
31
31
pin output data is to be inverted.
pin input data is to be inverted.
CC
CC
SS
with an on-chip pull-up MOS.
with an external resister of
with an external resister of
(initial value)
(initial value)