Operation In Synchronous Mode (Operation Mode 2) - Fujitsu F2MC-16LX Hardware Manual

21.3.2 Operation in Synchronous Mode (Operation Mode 2)

The transfer operation becomes clock-synchronous when the UART operates in
Operation Mode 2 (normal mode).
I Operation in synchronous mode (operation mode 2)
❍ Transfer Data Format
In synchronous mode, 8-bit data is transferred LSB first, and no start bit or stop bit are added.
Figure 21.3-5 "Transfer data format (in synchronous mode)" shows the data format in
synchronous mode:
Send data write
Send and receive clock
RXE,TXE
Send and receive data
❍ Clock Supply
In a clock synchronous (expanded I/O serial) operation, a number of clock pulses equivalent to
the number of bits in the transmission data must be supplied during transmission.
When an internal clock (dedicated baud rate generator or internal timer) is selected, a data
reception synchronous clock will be supplied automatically when data is sent.
If an external clock is selected, the output data register (SODR) in the UART of the transmission
side system must contain data. After confirmation that TDRE of the SSR is 0, clock pulses for
one byte must be supplied correctly from the outside.
Always set the mark level "H" before and after sending data.
❍ Error Detection
Only overrun errors can be detected. Parity and framing errors cannot be detected.
Figure 21.3-5 Transfer data format (in synchronous mode)
1
LSB
0 1 1 0 0
Data
CHAPTER 21 UART
Mark level
1 0
MSB
413