upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 424

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

Chapter 12 Asynchronous Serial Interface A (UARTA)
12.5.7 Noise filter of receive data
The RXDAn pin is sampled using the UART internal clock (f
).
XCLK
If the sampled value is the same twice in a row, the output of the match detector changes, and the sig-
nal on the RXDAn pin is sampled as input data.
Because the circuit configuration of the noise filter is as shown in Figure 12-15, internal processing of a
reception operation is delayed two clocks from the external signal status.
Figure 12-15: Noise Filter Circuit
fxclk
(internal UART clock)
Internal signal B
Internal signal A
RXDAn
In
Internal signal C
Q
In
In
Q
Q
Match
LD_EN
detector
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User’s Manual U16702EE3V2UD00