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Chapter 12
Asynchronous Serial Interface A (UARTA)
User’s Manual U16702EE3V2UD00
(8)
Transfer rate for continuous transmission
The transfer rate from the stop bit to the start bit of the next data is extended two clocks when con-
tinuous transmission is executed. However, the timing on the reception side is initialized when the
start bit is detected, and therefore, the transfer result is not affected.
Figure 12-18:
Transfer Rate for Continuous Transmission
Where 1 bit data length is FL, stop bit length is FLstp, and base clock frequency is f
XCLK
, the stop
bit length can be calculated by the following expression.
FLstp = FL + 2/f
XCLK
Therefore, the transfer rate for continuous transmission is as follows.
Transfer rate = 11
×
FL + 2/f
XCLK
12.7 Caution for Use in On-chip Debug Mode
When a break command is detected while UARTA received data in on-chip debug mode, an overrun
error is generated.
Bit 0
Start bit
Start bit
Bit 1
Bit 7
Parity bit
Stop bit
FL
1 data frame
FL
FL
FL
FL
FL
FL
FLstp
Start bit in
second byte
Bit 0
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