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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(7)
Receive data noise filter
The RXD5n signal is sampled at the rising edge of the prescaler output basic clock (Clock). If the
same sampling value is obtained twice, the match detector output changes, and this output is
sampled as input data. Therefore, data not exceeding one clock width is judged to be noise and is
not delivered to the internal circuit (see Figure 12-15). Refer to 12.2.6 (1) (a) Basic clock (Clock)
regarding the basic clock.
Also, since the circuit is configured as shown in Figure 12-14, internal processing during a receive
operation is delayed by up to 2 clocks according to the external signal status.
Figure 13-14:
Noise Filter Circuit
Figure 13-15:
Timing of RXD5n Signal Judged as Noise
Remark:
n = 0, 1
RXD5n
Q
Clock
In
LD_EN
Q
In
Internal signal A
Internal signal B
Match detector
Internal signal A
Clock
RXD5n (input)
Internal signal B
Match
Mismatch
(judged as noise)
Mismatch
(judged as noise)
Match
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