HD6473032F16 Datasheet, PDF (311/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Pin
P91/TxD1
P90/TxD0
Section 9 I/O Ports
Pin Functions and Selection Method
Bit TE in SCR of SCI1 and bit P91DDR select the pin function as follows
TE
0
1
P91DDR
Pin function
0
P91 input
1
P91 output
—
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
Pin function
0
P90 input
1
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.
9.11 Port A
9.11.1 Overview
Port A is an 8-bit input/output port that is also used for output (TP₇ to TP₀) from the
programmable timing pattern controller (TPC), input and output (TIOCB₂, TIOCA₂, TIOCB₁,
TIOCA₁, TIOCB₀, TIOCA₀, TCLKD, TCLKC, TCLKB, TCLKA) by the 16-bit integrated timer
unit (ITU), output (TEND₁, TEND₀) from the DMA controller (DMAC), CS₄ to CS₆ output, and
address output (A₂₃ to A₂₀). A reset or hardware standby leaves port A as an input port, except that
in modes 3, 4, and 6, one pin is always used for A₂₀ output. Usage of pins for TPC, ITU, and
DMAC input and output is described in the sections on those modules. For output of address bits
A₂₃ to A₂₁ in modes 3, 4, and 6, see section 6.2.5, Bus Release Control Register (BRCR). For
output of CS₄ to CS₆ in modes 1 to 6, see section 6.3.2, Chip Select Signals. Pins not assigned to
any of these functions are available for generic input/output. Figure 9.10 shows the pin
configuration of port A.
Pins in port A can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington transistor pair. Port A has Schmitt-trigger inputs.
Rev. 3.00 Mar 21, 2006 page 281 of 814
REJ09B0302-0300