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10.5.3
Pin Functions
The pins of port 7 are multipurpose pins which function as 8-bit timer I/O pins, (TMRI01,
TMCI01, TMRI23, TMCI23, TMO0, TMO1, TMO2, TMO3), DMAC I/O pins (DREQ0, TEND0,
DREQ1, TEND1), bus control output pins (CS4 to CS7), IIC input pin (SYNCI), SCI I/O pins
(SCK3, RxD3, TxD3) and manual reset input pin (MRES). Table 10-8 shows the functions of port
7 pins.
Table 10-8 Port 7 Pin Functions
Pin
Selection Method and Pin Functions
P77/TxD3
Switches as follows according to combinations of SCR TE bit of SCI3, and the
P77DDR bit.
TE
P77DDR
Pin function
P76/RxD3
Switches as follows according to combinations of SCR RE bit of SCI3 and the
P76DDR bit.
RE
P76DDR
Pin function
P75/TMO3/
Switches as follows according to combinations of SMR C/A bit of SCI3, SCR CKE0
SCK3
and CKE1 bits, TCSR3 OS3 to OS0 bits of the 8-bit timer, and the P75DDR bit.
OS3 to OS0
CKE1
C/A
CKE0
P75DDR
Pin function
358
0
0
P77 input pin
P77 output pin
0
0
P76 input pin
P76 output pin
0
0
0
1
P75
P75
input pin
output pin
1
1
All 0
0
1
1
—
—
—
SCK3
SCK3
output pin
output pin
1
—
TxD3 output pin
1
—
RxD3 I/O pin
Any is 1
1
—
—
—
—
—
—
—
SCK3
TMO3
input pin
Output
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