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
High- Retains
Retains
High- Retains
Functional
Functional
P3
6
/AEVH
impedance
previous
previous
impedance
*
previous
P3
5
/TXD
31
state
state
state
P3
4
/RXD
31
P3
3
/SCK
31
P3
2
/
RESO
RESO output
P3
1
/UD
High-
P3
0
/PWM
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
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