SAM4L Datasheet, PDF (621/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
SYNC = 1: USART operates in Synchronous mode.
If USART operates in SPI Mode, CPHA determines which edge of CLK causes data to change and which edge causes data to
be captured. CPHA is used with CPOL to produce the required clock/data relationship between master and slave devices.
CPHA = 0: Data is changed on the leading edge of CLK and captured on the following edge of CLK.
CPHA = 1: Data is captured on the leading edge of CLK and changed on the following edge of CLK.
• CHRL: Character Length.
Table 24-21.
CHRL
0
0
0
1
1
0
1
1
Character Length
5 bits
6 bits
7 bits
8 bits
• USCLKS: Clock Selection
Table 24-22.
USCLKS
0
0
0
1
1
0
1
1
Selected Clock
CLK_USART
CLK_USART/DIV⁽¹⁾
Reserved
CLK
Note: 1. The value of DIV is device dependent. Refer to the Module Configuration section at the end of this chapter.
• MODE
Table 24-23.
0
0
0
0
0
0
1
1
1
1
1
MODE
0
0
0
0
0
1
0
1
1
0
1
1
0
0
0
1
0
1
1
1
1
1
Others
Mode of the USART
0
Normal
1
RS485
0
Hardware Handshaking
1
Modem
0
IS07816 Protocol: T = 0
0
IS07816 Protocol: T = 1
0
IrDA
0
LIN Master
1
LIN Slave
0
SPI Master
1
SPI Slave
Reserved
42023C–SAM–02/2013
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