Register Configuration And Descriptions - Hitachi H8/3827R Series Hardware Manual

8.11.2

Register Configuration and Descriptions

Table 8.27 shows the registers used by the input/output data inversion function.
Table 8.27 Register Configuration
Name
Serial port control register
Serial Port Control Register (SPCR)
Bit 7
—
Initial value 1
Read/Write —
SPCR is an 8-bit readable/writable register that performs RXD
input/output data inversion switching. SPCR is initialized to H'C0 by a reset.
Bit 0: RXD pin input data inversion switch
31
Bit 0 specifies whether or not RXD
Bit 0
SCINV0 Description
0 RXD
31
1 RXD
31
Bit 1: TXD pin output data inversion switch
31
Bit 1 specifies whether or not TXD
Bit 1
SCINV1 Description
0 TXD
31
1 TXD
31
Abbreviation
SPCR
6 5
— SPC32
1 0
— R/W
pin input data is to be inverted.
31
input data is not inverted
input data is inverted
pin output data is to be inverted.
31
output data is not inverted
output data is inverted
R/W
R/W
4 3
SPC31 SCINV3 SCINV2
0 0
R/W R/W
, RXD
31
Address
H'FF91
2 1
SCINV1 SCINV0
0 0
R/W R/W R/W
, TXD , and TXD
32 31
(initial value)
(initial value)
0
0
pin
32
171