149
8.3.4
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
*
Retains
previous
state
Functional Functional
P3
2
/
RESO
RESO output
P3
1
/UD
P3
0
/PWM
High-
impedance
Note:
*
A high-level signal is output when the MOS pull-up is in the on state.
8.3.5
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
0
0
1
PUCR3
n
0
1
*
MOS input pull-up
Off
On
Off
(n = 7 to 0)
*
: Don’t care