Register Configuration And Descriptions - Renesas H8 Series Hardware Manual

8.12.2

Register Configuration and Descriptions

Table 8.31 shows the registers used by the input/output data inversion function.
Table 8.31 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
inversion switching.
Bits 7 and 6—Reserved
Bits 7 and 6 are reserved; they are always read as 1 and cannot be modified.
Bit 5—P4 /TXD Pin Function Switch (SPC32)
2 32
This bit selects whether pin P4
Bit 5
SPC32 Description
0 Functions as P4
1 Functions as TXD
Note: * Set the TE bit in SCR3 after setting this bit to 1.
Bit 4—Reserved
Bit 4 is reserved; it can only be written with 0.
Abbr.
SPCR
6 5 4
 
SPC32

1 0

R/W W
/TXD is used as P4
2 32
I/O pin
2
output pin *
32
R/W Address
R/W H'FF91
3
2
SCINV3 SCINV2
0 0
R/W R/W
and TXD
32
or as TXD .
2 32
Rev. 7.00 Mar 10, 2005 page 241 of 652
Section 8 I/O Ports
1 0
 
 
W W
pin input/output data
32
(initial value)
REJ09B0042-0700