Note On Modification Of Serial Port Control Register - Renesas H8 Series Hardware Manual

Section 8 I/O Ports
Bit 3—TXD Pin Output Data Inversion Switch
32
Bit 3 specifies whether or not TXD
Bit 3
SCINV3 Description
0 TXD output data is not inverted
32
1 TXD output data is inverted
32
Bit 2—RXD Pin Input Data Inversion Switch
32
Bit 2 specifies whether or not RXD
Bit 2
SCINV2 Description
0 RXD input data is not inverted
32
1 RXD input data is inverted
32
Bits 1 and 0—Reserved
Bits 1 and 0 are reserved; they can only be written with 0.
8.12.3

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.
Rev. 7.00 Mar 10, 2005 page 242 of 652
REJ09B0042-0700
pin output data is to be inverted.
32
pin input data is to be inverted.
32
(initial value)
(initial value)