Input/Output Data Inversion Function; Register Configuration And Descriptions - Hitachi HD6473867 Hardware Manual

8.11 Input/Output Data Inversion Function

8.11.1 Overview
With input pins WKP
can be handled in inverted form.

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.
to WKP
, RXD , and RXD
0 7 31
P3 /RXD
4 31
P4 /RXD
1 32
P3 /TXD
5 31
P4 /TXD
2 32
Figure 8.10 Input/Output Data Inversion Function
Abbreviation
SPCR
6 5
— SPC32
1 0
— R/W
, and output pins TXD
32
SCINV0
SCINV2
SCINV1
SCINV3
R/W
R/W
4 3
SPC31 SCINV3 SCINV2
0 0
R/W R/W
, RXD
31
170
and TXD
31
RXD
31
RXD
32
TXD
31
TXD
32
Address
H'FF91
2 1
SCINV1 SCINV0
0 0
R/W R/W R/W
, TXD , and TXD
32 31
, the data
32
0
0
pin
32