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8.3.4
Pin States
Table 8.7 shows the port 2 pin states in each operating mode.
Table 8.7
Port 2 Pin States
Pins
Reset
P2
/IRQ
High-
7
0
impedance
P2
/TXD
High-
6
impedance
P2
/RXD
5
P2
/SCK
4
3
P2
/SO
3
1
P2
/SI
2
1
P2
/SCK
1
1
P2
/IRQ
/
0
4
ADTRG
Note: * High level output if the MOS pull-up is on.
8.3.5
MOS Input Pull-Up
Port 2 has a built-in MOS input pull-up function that can be controlled by software. When a PCR2
bit is cleared to 0, setting the corresponding PUCR2 bit to 1 turns on the MOS pull-up for that pin.
The MOS input pull-up function is in the off state after a reset.
PCR2
n
PUCR2
n
MOS input pull-up
Note: * Don't care
(n = 6 to 0)
Note: As P2
is an input-only pin, the MOS pull-up is turned off regardless of whether PUCR2
7
is set to 1 or cleared to 0.
Sleep
Subsleep Standby
High-
High-
impedance
impedance
Retains
Retains
previous
previous
state
state
0
0
1
Off
On
Watch
High-
High-
impedance
impedance
High-
Retains
impedance*
previous
state
1
*
Off
Subactive Active
High-
High-
impedance
impedance
Functional Functional
135
7
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