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19.7
Transfer Data Format
UART0, UART1 only handle NRZ (non-return-to-zero) type data. Figure 19.7-1 shows the
relationship between the transmit/receive clock and the data for CLK synchronous
mode.
■ Transfer Data Format
SCK0
SIN0, SOT0
The transferred data is "01001101
As shown in Figure 19.7-1, the transfer data always starts with the start bit ("L" level data), the specified
number of data bits are transmitted with the LSB first, then transmission ends with the stop bit ("H" level
data). Always input a clock if external clock operation is selected. When an internal clock (the dedicated
baud rate generator or 16-bit Reload Timer) is selected, the clock is output continuously. When using CLK
synchronous transfer, do not start data transfer until the selected baud rate clock has stabilized (for two
baud rate clock cycles).
When using CLK asynchronous transfer, set the SCKE bit in the UMC0, UMC1 register to "0" to disable
clock output. The transfer data format of SIN0, SIN1 and SOUT0, SOUT1 is the same as shown in Figure
19.7-1.
Figure 19.7-1 Transfer Data Format
0
1
0
1
1
Start
LSB
" (mode 1) or "101001101
" (mode 3).
B
B
CHAPTER 19 UART0, UART1
0
0
1
0
1
MSB
Stop
D8 Stop
1
⎫
Depends
⎬
on the mode.
⎭
327
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