HD64F3028F25 Datasheet, PDF (316/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Pin
P91/TxD1
P90/TxD0
Pin Functions and Selection Method
Bit TE in SCR of SCI1, bit SMIF in SCMR, and bit P91DDR select the pin function
as follows.
SMIF
0
1
TE
0
1
—
P91 DDR
0
1
—
—
Pin function
P91 input
P91 output
TxD1 output TxD1 output^*
Note: * Functions as the TxD1 output pin, but there are two states: one in which
the pin is driven, and another in which the pin is at high-impedance.
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 highimpedance.
Rev. 2.00, 09/03, page 284 of 890