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156
Pin
Pin Functions and Selection Method
P9
1
/TxD
1
Bit TE in SCR of SCI1, bit SMIF in SCMR, and bit P9
1
DDR select the pin
function as follows.
SMIF
0
1
TE
0
1
—
P9
1
DDR
0
1
—
—
Pin function
P9
1
input
P9
1
output
TxD
1
output
TxD
1
output*
Note: * Functions as the TxD
1
output pin, but there are two states: one in
which the pin is driven, and another in which the pin is at high-
impedance.
P9
0
/TxD
0
Bit TE in SCR of SCI0, bit SMIF in SCMR, and bit P9
0
DDR select the pin
function as follows.
SMIF
0
1
TE
0
1
—
P9
0
DDR
0
1
—
—
Pin function
P9
0
input
P9
0
output
TxD
0
output
TxD
0
output*
Note: * Functions as the TxD
0
output pin, but there are two states: one in
which the pin is driven, and another in which the pin is at high-
impedance.
7.7
Port A
7.7.1
Overview
Port A is an 8-bit input/output port that is also used for output (TP
7
to TP
0
) from the programmable
timing pattern controller (TPC), input and output (TIOCB
2
, TIOCA
2
, TIOCB
1
, TIOCA
1
, TIOCB
0
,
TIOCA
0
, TCLKD, TCLKC, TCLKB, TCLKA) by the 16-bit timer, clock input (TCLKD, TCLKC,
TCLKB, TCLKA) to the 8-bit timer, and address output (A
23
to A
20
). A reset or hardware standby
transition leaves port A as an input port, except that in modes 3 and 4, one pin is always used for
A
20
output. See tables 7.12 to 7.14 for the selection of pin functions.
Usage of pins for TPC, 16-bit timer, and 8-bit timer input and output is described in the sections
on those modules. For output of address bits A
23
to A
20
in modes 3 and 4, see section 6.2.4, Bus
Release Control Register (BRCR). Pins not assigned to any of these functions are available for
generic input/output. Figure 7.6 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.
Summary of Contents for H8/3008
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