R01UH0822EJ0100 Rev.1.00
Page 469 of 1041
Jul 31, 2019
RX13T Group
19. Multi-Function Timer Pulse Unit 3 (MTU3c)
19.3.14
Noise Filter Function
The input capture input pins and external pulse input pins have a noise filter function.
Set the NFCRn register (n = 0 to 5, C) to enable or disable the noise filter function and set the sampling clock. The noise
filter for each pin can be enabled or disabled individually, and the sampling clock can be set for each channel.
shows the timing of noise filtering.
Figure 19.98
Timing of Noise Filtering
19.3.15
A/D Conversion Start Request Frame Synchronization Signal
This function can be used to monitor the generation timing of the A/D conversion start request signal using an external
pin.
When the A/D conversion request signal to be monitored is selected by the TADSTRGR0 register, a pulse signal is
output from the ADSM0 pin that is at the high level when the A/D conversion start request signal is generated, and at the
low level in the timer cycle used to generate the A/D conversion start request signal.
shows an example of outputting the A/D conversion start request frame synchronization signal.
Figure 19.99
Example of Outputting A/D Conversion Start Request Frame Synchronization Signal
Noise filtering function is enabled.
Noise filtering function is disabled.
Sampling clock
Input capture input pin or
external pulse input pin
Noise filtering function enable/
disable register
Internal transfer signal
Three-time
match
Pulses are
removed.
Time
0000h
MTU3.TADCORA
MTU4.TADCORA
MTU3.TGRA
MTU4.TGRA
MTU3.TCNT
MTU4.TCNT
TRG4AN
(A/D conversion start
request)
ADSM0
*1
Note 1. When TRG4AN is selected for ADSM0 output.