Datasheet

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 223 of 680
REJ09B0145-0600
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
0
/PWM pin function switch (PWM)
This bit selects whether pin P3
0
/PWM is used as P3
0
or as PWM.
Bit 0
PWM Description
0 Functions as P3
0
I/O pin (initial value)
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
7
/AEVL The pin function depends on bit SO1 in PMR3 and bit PCR3
2
in PCR3.
AEVL 0 1
PCR3
7
01 *
Pin function P3
7
input pin P3
7
output pin AEVL input pin
P3
6
/AEVH The pin function depends on bit AEVH in PMR3 and bit PCR3
6
in PCR3.
AEVH 0 1
PCR3
6
01 *
Pin function P3
6
input pin P3
6
output pin AEVH input pin
P3
5
/TXD
31
The pin function depends on bit TE in SCR3-1, bit SPC31 in SPCR, and bit
PCR3
5
in PCR3.
SPC31 0 1
TE 0 1
PCR3
5
01 *
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 SCR3-1 and bit PCR3
4
in PCR3.
RE 0 1
PCR3
4
01 *
Pin function P3
4
input pin P3
4
output pin RXD
31
input pin