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

21.7.2

Operation in Synchronous Mode (Operation Mode 2)

The UART uses clock-synchronous transfer when used in operation mode 2 (normal
mode).
Operation in Synchronous Mode (Operation Mode 2)
Format of transmit/receive data
In the synchronous mode, 1 to 8 bits of data is transferred and the stop bit is not appended. Figure 21.7-3
shows the formats of send and receive data in the clock synchronization mode.
Figure 21.7-3 Format of Transmit/Receive Data (Operation Mode 2)
When transfer by output serial clock
SCK0 to SCK3 output
Transfer data write
When transfer by input serial clock
SCK0 to SCK3 output
Receive data write
Clock Supply
In the clock synchronous mode, count of clocks equal to the transmit and receive bits count must be
supplied.
When the internal clock (a dedicated baud rate generator) has been selected, the synchronous clock for
receiving data is automatically generated by sending data.
When the external clock has been selected, exactly one byte of clock should be provided externally after
making sure that the serial output data registers 0 to 3 (SODR0 to SODR3) contains sending data (SSR0 to
SSR3: TDRE=0). Also, both before and after sending, ensure that the level is marked with "H".
SOT0 to SOT3
(LSB)
1
TXE
SIN0 to SIN3
(LSB) 1
RXE
0 1 1 0 0
Transfer data
0 1 1 0 0
Receive data
CHAPTER 21 UART
Mark level
(MSB)
1
Mark level
(MSB)
1
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