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
P37/AEVL
P36/AEVH
P35/TXD31
P34/RXD31
P33/SCK31
High-
Retains
previous
state
Retains
previous
state
High-
Retains
Functional Functional
impedance
impedance* previous
state
P32/RESO
Reset output
P31/UD
High-
P30/PWM
impedance
Note:
*
A high-level signal is output when the MOS pull-up is in the on state.
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.
PCR3n
0
0
1
PUCR3n
0
1
*
MOS input pull-up
Off
On
Off
(n = 7 to 0)
*: Don’t care
151
ETC [ ETC ]
