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In the H8/38347 Group and H8/38447 Group this pin is a combined P31/UD/EXCL pin. Refer to
the description of port mode register 2 in 8.3, Port 2, for details on switching to the EXCL pin
function.
Bit 0: P3
/PWM pin function switch (PWM)
0
This bit selects whether pin P3
Bit 0
PWM
Description
0
Functions as P3
1
Functions as PWM output 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
/AEVL
The pin function depends on bit SO1 in PMR3 and bit PCR3
7
P3
/AEVH
The pin function depends on bit AEVH in PMR3 and bit PCR3
6
P3
/TXD
The pin function depends on bit TE in SCR3-1, bit SPC31 in SPCR, and bit
5
31
PCR3
P3
/RXD
The pin function depends on bit RE in SCR3-1 and bit PCR3
4
31
/PWM is used as P3
0
I/O pin
0
AEVL
PCR3
7
Pin function
P3
AEVH
PCR3
6
Pin function
P3
in PCR3.
5
SPC31
TE
PCR3
5
Pin function
P3
RE
PCR3
4
Pin function
P3
or as PWM.
0
0
0
1
input pin
P3
output pin
7
7
0
0
1
input pin
P3
output pin
6
6
0
0
0
1
input pin
P3
output pin
5
5
0
0
1
input pin
P3
output pin
4
4
Rev. 6.00 Aug 04, 2006 page 223 of 680
Section 8 I/O Ports
(initial value)
in PCR3.
2
1
*
AEVL input pin
in PCR3.
6
1
*
AEVH input pin
1
1
*
TXD
output pin
31
in PCR3.
4
1
*
RXD
input pin
31
REJ09B0145-0600
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