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Port Mode Register 2 (PMR2)
Bit
IRQ0
Initial value
Read/Write
R/W
PMR2 is an 8-bit read/write register for controlling the selection of pin functions for pins P2
P2
and P2
, controlling the PMOS on/off option for pin P2
3
7
noise canceller.
Upon reset, PMR2 is initialized to H'40.
Bits 7—P2
/IRQ
Pin Function Switch (IRQ0): This bit selects whether pin P2
7
0
or as IRQ
P2
.
7
0
Bit 7: IRQ0
0
1
Bit 6—Reserved Bit: Bit 6 is reserved: it is always read as 1, and cannot be modified.
Bit 5—P2
/SO
pin PMOS control (POF1): This bit turns on and off the PMOS transistor in the
3
1
P2
/SO
pin output buffer.
3
1
Bit 5: POF1
0
1
Bit 4—TMIG noise canceller select (NCS): This bit controls the noise canceller circuit for input
capture at pin TMIG.
Bit 4: NCS
0
1
130
7
6
—
POF1
0
1
—
R/W
Description
Functions as P2
input pin
7
Functions as IRQ
input pin
0
Description
CMOS output
NMOS open-drain output
Description
Noise canceller function not selected
Noise canceller function selected
5
4
NCS
SO1
0
0
R/W
R/W
/SO
3
3
2
SI1
SCK1
0
0
R/W
R/W
, and controlling the TMIG input
1
/IRQ
7
1
0
IRQ4
0
0
R/W
to
0
is used as
0
(initial value)
(initial value)
(initial value)
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