151
Bit 2: P3
2
/
RESO
pin function switch (RESO)
This bit selects whether pin P3
2
/
RESO
is used as P3
2
or as
RESO
.
Bit 2
RESO
Description
0
Functions as P3
2
I/O pin
1
Functions as
RESO
output pin
(initial value)
Bit 1: P3
1
/UD pin function switch (UD)
This bit selects whether pin P3
1
/UD is used as P3
1
or as UD.
Bit 1
UD
Description
0
Functions as P3
1
I/O pin
(initial value)
1
Functions as UD input pin
8.4.3
Pin Functions
Table 8-9 shows the port 3 pin functions.
Table 8-9
Port 3 Pin Functions
Pin
Pin Functions and Selection Method
P3
7
, P3
6
, P3
0
The pin function depends on bit PCR3n in PCR3.
(n=7, 6, 0)
PCR3
n
0
1
Pin function
P3
n
input pin
P3
n
output pin
P3
5
/TXD
31
The pin function depends on bit TE in SCR31, bit SPC31 in SPCR, and bit
PCR3
5
in PCR3.
SPC31
0
1
TE
0
1
PCR3
5
0
1
*
Pin function
P3
5
input pin
P3
5
output pin
TXD
31
output pin
P3
4
/RXD
31
The pin function depends on bit RE in SCR31 and bit PCR3
4
in PCR3.
RE
0
1
PCR3
4
0
1
*
Pin function
P3
4
input pin
P3
4
output pin
RXD
31
input pin
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