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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(4)
Transfer rate during continuous transmission
During continuous transmission, the transfer rate from a stop bit to the next start bit is extended
two clocks of basic clock (Clock) longer than normal. However, on the reception side, the transfer
result is not affected since the timing is initialized by the detection of the start bit.
Figure 13-20:
Transfer Rate During Continuous Transmission
Representing the 1-bit data length by FL, the stop bit length by FLstp, and the basic clock
frequency by f
CLK
fields the following equation.
Therefore, the transfer rate during continuous transmission is as follows.
13.2.7 Precautions
When the supply of clocks to UART5n (n = 0, 1) is stopped (for example, IDLE or STOP mode),
operation stops with each register retaining the value it had immediately before the supply of clocks was
stopped. The TXD5n pin output also holds and outputs the value it had immediately before the supply
of clocks was stopped. However, operation is not guaranteed after the supply of clocks is restarted.
Therefore, after the supply of clocks is restarted, the circuits should be initialized by setting Power bit =
0, RXE bit = 0, and TXE bit = 0 in the ASIMn register.
Start bit
Bit 0
Bit 1
Bit 7
Parity bit
Stop bit
FL
1 data frame
Bit 0
FL
FL
FL
FL
FL
FL
FLstp
Start bit of
second byte
Start bit
FLstp
FL 2
f
CLK
⁄
+
=
Transfer rate = 11 x FL = 2 / f
CLK
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