HD6433937 Datasheet, PDF (162/521 Pages) Hitachi Semiconductor – Hardware Manual

4. Port mode register 3 (PMR3)
Bit
7
6
5
4
3
2
1
0
—
Initial value
0
Read/Write
—
— WDCKS NCS IRQ0 RESO UD
—
0
0
0
0
1
0
0
—
R/W
R/W
R/W
R/W
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
0
1
Description
ø/8192 selected
øw/32 selected
(initial value)
Bit 4: TMIG noise canceler select (NCS)
This bit controls the noise canceler for the input capture input signal (TMIG).
Bit 4
NCS
0
1
Description
Noise cancellation function not used
Noise cancellation function used
(initial value)
Bit 3: P4₃/IRQ₀ function switch (IRQ0)
This bit selects whether P4₃/IRQ₀ is used as P4₃ or as IRQ₀.
Bit 3
IRQ0
0
1
Description
Functions as P4₃ input
Functions as IRQ₀ input
(initial value)
150