R01UH0822EJ0100 Rev.1.00
Page 375 of 1041
Jul 31, 2019
RX13T Group
19. Multi-Function Timer Pulse Unit 3 (MTU3c)
19.2.32
Noise Filter Control Register n (NFCRn) (n = 0 to 4, C)
MTU0.NFCR0, MTU1.NFCR1, MTU2.NFCR2, MTU3.NFCR3, MTU4.NFCR4
Note 1. These bits are reserved in MTU1 and MTU2. These bits are read as 0 and writing to them has no effect.
The NFCRn register (n = 0 to 4) sets the noise filter function of input capture pins for the corresponding channel.
NFAEN Bit (Noise Filter A Enable)
This bit disables or enables the noise filter for input from the MTIOCnA pin. Since changing the value of the bit may
lead to the internal generation of an unexpected edge, select the output compare function for the relevant pin in the timer
I/O control register or set the TMDR.MD[3:0] bits to a value other than that for normal mode (0000b) before doing so.
NFBEN Bit (Noise Filter B Enable)
This bit disables or enables the noise filter for input from the MTIOCnB pin. Since changing the value of the bit may lead
to the internal generation of an unexpected edge, select the output compare function for the relevant pin in the timer I/O
control register or set the TMDR.MD[3:0] bits to a value other than that for normal mode (0000b) before doing so.
NFCEN Bit (Noise Filter C Enable)
This bit disables or enables the noise filter for input from the MTIOCnC pin. Since changing the value of the bit may lead
to the internal generation of an unexpected edge, select the output compare function for the relevant pin in the timer I/O
control register or set the TMDR.MD[3:0] bits to a value other than that for normal mode (0000b) before doing so.
NFDEN Bit (Noise Filter D Enable)
This bit disables or enables the noise filter for input from the MTIOCnD pin. Since changing the value of the bit may
lead to the internal generation of an unexpected edge, select the output compare function for the relevant pin in the timer
I/O control register or set the TMDR.MD[3:0] bits to a value other than that for normal mode (0000b) before doing so.
Address(es): MTU0.NFCR0 0009 5290h, MTU1.NFCR1 0009 5291h, MTU2.NFCR2 0009 5292h, MTU3.NFCR3 0009 5293h,
MTU4.NFCR4 0009 5294h
b7
b6
b5
b4
b3
b2
b1
b0
—
—
NFCS[1:0]
NFDEN NFCEN NFBEN NFAEN
Value after reset:
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b0
Noise Filter A Enable
0: The noise filter for the MTIOCnA pin is disabled.
1: The noise filter for the MTIOCnA pin is enabled.
R/W
b1
Noise Filter B Enable
0: The noise filter for the MTIOCnB pin is disabled.
1: The noise filter for the MTIOCnB pin is enabled.
R/W
b2
Noise Filter C Enable*
0: The noise filter for the MTIOCnC pin is disabled.
1: The noise filter for the MTIOCnC pin is enabled.
R/W
b3
Noise Filter D Enable*
0: The noise filter for the MTIOCnD pin is disabled.
1: The noise filter for the MTIOCnD pin is enabled.
R/W
b5, b4
NFCS[1:0] Noise Filter Clock Select
b5 b4
0 0: PCLKB/1
0 1: PCLKB/8
1 0: PCLKB/32
1 1: Clock source for counting
R/W
b7, b6
—
Reserved
These bits are read as 0. The write value should be 0.
R/W