Hitachi H8/3022 Hardware Manual page 174

Pin Pin Functions and Selection Method
P9 /TxD Bit TE in SCR of SCI1 and bit P9
1 1
TE
P9 DDR
1
Pi n funct i on
P9 /TxD Bit TE in SCR of SCI0, bit SMIF in SCMR, and bit P9
0 0
follows
SMIF
TE
P9 DDR
0
Pi n funct i on
Note: * Functions as the TxD
162
0
P9 input
1
0
0
P9 input
0
pin is driven, and another in which the pin is at high impedance.
DDR select the pin function as follows
1
0
1
P9 output
1
0
1
P9 output TxD
0
output pin, but there are two states : one in which the
0
1
—
TxD output
1
DDR select the pin function as
0
1
—
output TxD
0
1
—
—
output*
0