UPD703111A Datasheet, PDF (420/974 Pages) NEC – 32-Bit Single-Chip Microcontroller

CHAPTER 9 TIMER/COUNTER FUNCTION
(4) Noise elimination width setting registers C0 to C3 (NCWC0 to NCWC3)
The NCWCn registers are used to set the noise elimination width of the digital noise filter of the timer C input
pin (n = 0 to 3).
These registers can be read or written in 8-bit units.
Be sure to clear bits 7 to 2 to 0. If they are set to 1, the operation is not guaranteed.
In addition, do not overwrite this register during timer operation.
7
6
5
4
3
2
1
0
Address After reset
NCWC0
0
0
0
0
0
0 NCCC01 NCCC00 FFFFF610H
02H
NCWC1
0
0
0
0
0
0 NCCC11 NCCC10 FFFFF630H
02H
NCWC2
0
0
0
0
0
0 NCCC21 NCCC20 FFFFF650H
02H
NCWC3
0
0
0
0
0
0 NCCC31 NCCC30 FFFFF670H
02H
Bit position
1, 0
Bit name
NCCCn1,
NCCCn0
Function
Specifies the number of clocks by which noise is to be eliminated.
NCCCn1 NCCCn0
Number of clocks by which noise is to be eliminated
0
0
0 (through input)
0
1
2
1
0
3
1
1
5
Remark 1 clock = fX/4
fX: Main clock
Remark n = 0 to 3
420
User’s Manual U16031EJ4V1UD