654
/
838
Nations Technologies Inc.
Tel
：
+86-755-86309900
：
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Synchronized receiving
The receiver in synchronous mode works differently than in asynchronous mode. Data is sampled on CK without any
oversampling. But setup time and hold time (depending on baud rate, 1/16 bit time) must be considered.
Figure 23-14 USART synchronous transmission example
Figure 23-15 USART data clock timing example (WL=0)
USART
SPI
（
slave
）
RX
TX
CLK
MISO
MOSI
Clock
（
CLKPOL=0
，
CLKPHA=0
）
Clock
（
CLKPOL=0
，
CLKPHA=1
）
Clock
（
CLKPOL=1
，
CLKPHA=0
）
Clock
（
CLKPOL=1
，
CLKPHA=1
）
Data on TX
(from master)
Data on RX
(from slave)
Start LSB
MSB Stop
MSB
LSB
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
