HD6433044 Datasheet, PDF (288/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Table 9-17 Port 9 Pin Functions (cont)
Pin
P9₁/TxD₁
P9₀/TxD₀
Pin Functions and Selection Method
Bit TE in SCR of SCI1 and bit P9₁DDR select the pin function as follows
TE
P9₁DDR
Pin function
0
0
1
P9₁ input P9₁ output
1
—
TxD₁ output
Bit TE in SCR of SCI0, bit SMIF in SCMR, and bit P9₀DDR select the pin
function as follows
SMIF
0
1
TE
0
1
—
P9₀DDR
0
1
—
—
Pin function
P9₀ input P9₀ output TxD₀ output TxD₀ output*
Note: * Functions as the TxD₀ output pin, but there are two states: one in
which the pin is driven, and another in which the pin is at high-
impedance.
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