HD6433937 Datasheet, PDF (188/521 Pages) Hitachi Semiconductor – Hardware Manual

8.13 Input/Output Data Inversion Function
8.13.1 Overview
With input pins RXD₃₁, and RXD₃₂, and output pins TXD₃₁ and TXD₃₂, the data can be handled in
inverted form.
SCINV0
SCINV2
P3₄/RXD₃₁
P4₁/RXD₃₂
SCINV1
SCINV3
RXD₃₁
RXD₃₂
P3₅/TXD₃₁
P4₂/TXD₃₂
TXD₃₁
TXD₃₂
Figure 8.12 Input/Output Data Inversion Function
8.13.2 Register Configuration and Descriptions
Table 8.33 shows the registers used by the input/output data inversion function.
Table 8.33 Register Configuration
Name
Serial port control register
Abbreviation
R/W
SPCR
R/W
Initial Value
H'C0
Address
H'FF91
Serial Port Control Register (SPCR)
Bit
7
6
5
—
— SPC32
Initial value
1
1
0
Read/Write
—
—
R/W
4
3
2
1
0
SPC31 SCINV3 SCINV2 SCINV1 SCINV0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
SPCR is an 8-bit readable/writable register that performs RXD₃₁, RXD₃₂, TXD₃₁, and TXD₃₂ pin
input/output data inversion switching. SPCR is initialized to H'C0 by a reset.
176