Datasheet

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 225 of 680
REJ09B0145-0600
8.4.4 Pin States
Table 8.10 shows the port 3 pin states in each operating mode.
Table 8.10 Port 3 Pin States
Pins Reset Sleep Subsleep Standby Watch Subactive Active
P3
7
/AEVL
P3
6
/AEVH
P3
5
/TXD
31
P3
4
/RXD
31
P3
3
/SCK
31
High-
impedance
Retains
previous
state
Retains
previous
state
High-
impedance
*
1
Retains
previous
state
Functional Functional
P3
2
/RESO
*
2
Reset output
P3
2
*
3
P3
1
/UD
*
2
P3
1
/UD/EXCL
*
3
P3
0
/PWM
High-
impedance
Notes: 1. A high-level signal is output when the MOS pull-up is in the on state.
2. Applies to H8/3847R Group and H8/3847S Group.
3. Applies to H8/38347 Group and H8/38447 Group.
8.4.5 MOS Input Pull-Up
Port 3 has a built-in MOS input pull-up function that can be controlled by software. When a
PCR3 bit is cleared to 0, setting the corresponding PUCR3 bit to 1 turns on the MOS pull-up for
that pin. The MOS pull-up function is in the off state after a reset.
PCR3
n
001
PUCR3
n
01*
MOS input pull-up Off On Off
(n = 7 to 0)
*: Don’t care