NEC 78K0/KB1+ Preliminary User's Manual page 262

(5) Data frame length during continuous transmission
When data is continuously transmitted, the data frame length from a stop bit to the next start bit is extended by
two clocks of base clock from the normal value. However, the result of communication is not affected because
the timing is initialized on the reception side when the start bit is detected.
Figure 12-27. Data Frame Length During Continuous Transmission
Start bit
FL
Where the 1-bit data length is FL, the stop bit length is FLstp, and base clock frequency is f
expression is satisfied.
FLstp = FL + 2/f
XCLK6
Therefore, the data frame length during continuous transmission is:
Data frame length = 11 × FL + 2/f
262
CHAPTER 12 SERIAL INTERFACE UART6
1 data frame
Bit 0 Bit 1
FL FL
XCLK6
Preliminary User's Manual U16846EJ1V0UD
Bit 7
Parity bit Stop bit
FL FL FLstp
Start bit of
second byte
Bit 0
Start bit
FL FL
, the following
XCLK6