150
4. Port mode register 3 (PMR3)
Bit
Initial value
Read/Write
7
—
0
—
6
—
0
—
5
WDCKS
0
R/W
4
NCS
0
R/W
3
IRQ0
0
R/W
0
—
0
—
2
RESO
1
R/W
1
UD
0
R/W
PMR3 is an 8-bit read/write register, controlling the selection of pin functions for port 3 pins.
Upon reset, PMR3 is initialized to H'04.
Bits 7, 6, and 0: Reserved bits
These bits are reserved: they are always read as 0 and cannot be modified.
Bit 5: Watchdog timer source clock select (WDCKS)
This bit selects the watchdog timer source clock.
Bit 5
WDCKS
Description
0
ø/8192 selected
(initial value)
1
øw/32 selected
Bit 4: TMIG noise canceler select (NCS)
This bit controls the noise canceler for the input capture input signal (TMIG).
Bit 4
NCS
Description
0
Noise cancellation function not used
(initial value)
1
Noise cancellation function used
Bit 3: P4
3
/
IRQ
0
function switch (IRQ0)
This bit selects whether P4
3
/
IRQ
0
is used as P4
3
or as
IRQ
0
.
Bit 3
IRQ0
Description
0
Functions as P4
3
input
(initial value)
1
Functions as
IRQ
0
input
Содержание H8/3935
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