Hitachi H8/3048 Hardware Manual page 288

Table 9-17 Port 9 Pin Functions (cont)
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Pin
P9 /TxD
1 1
P9 /TxD
0 0
Pin Functions and Selection Method
Bit TE in SCR of SCI1 and bit P9
TE
P9 DDR
1
Pin function P9
1
Bit TE in SCR of SCI0, bit SMIF in SCMR, and bit P9
function as follows
SMIF
TE
P9 DDR
0
Pin function P9
0
Note: * Functions as the TxD
which the pin is driven, and another in which the pin is at high-
impedance.
DDR select the pin function as follows
1
0
0 1
input P9 output
1
0
0
0 1
input P9 output
0
output pin, but there are two states: one in
0
275
1
—
TxD output
1
DDR select the pin
0
1
1 —
— —
TxD output TxD output*
0 0