参数资料
型号: EM250-RCM-R
厂商: Silicon Laboratories Inc
文件页数: 40/124页
文件大小: 0K
描述: EM250 RCM BOARD
标准包装: 12
类型: 收发器,802.15.4/Zigbee
频率: 2.4GHz
适用于相关产品: EM250
其它名称: 636-1023
EM250
5.2.1
UART Mode
The SC1 UART controller is enabled with SC1_MODE set to 1.
The UART mode contains the following features:
?
?
?
?
Baud rate (300bps up to 921kbps)
Data bits (7 or 8)
Parity bits (none, odd, or even)
Stop bits (1 or 2)
The following signals can be made available on GPIO pins:
?
?
?
?
TXD
RXD
nRTS (optional)
nCTS (optional)
The SC1 UART module obtains its reference baud-rate clock from a programmable baud generator. Baud rates
are set by a clock division ratio from the 24MHz clock:
rate = 24MHz / ( 2 * ( N + (0.5 * F) ) )
The integer portion, N, is written to the SC1_UARTPER register and the fractional remainder, F, to the
SC1_UARTFRAC register. Table 19 lists the supported baud rates with associated baud rate error. The
minimum allowable setting for SC1_UARTPER is 8.
Table 19. UART Baud Rates
Baud Rate (bps)
300
4800
9600
19200
38400
57600
115200
460800
921600
SC1_UARTPER
40000
2500
1250
625
312
208
104
26
13
SC1_UARTFRAC
0
0
0
0
1
1
0
0
0
Baud Rate Error (%)
0
0
0
0
0
- 0.08
0.16
0.16
0.16
The UART module supports various frame formats depending upon the number of data bits ( SC1_UART8BIT ),
the number of stop bits ( SC1_UART2STP ), and the parity ( SC1_UARTPAR plus SC1_UARTODD ). The register bits
SC1_UART8BIT , SC1_UART2STP , SC1_UARTPAR , and SC1_UARTODD are defined within the SC1_UARTCFG
register. In addition, the UART module supports flow control by setting SC1_UARTFLOW , SC1_UARTAUTO , and
SC1_UARTRTS in the SC1_UARTCFG register (see Table 20).
120-0082-000V Rev 1.1
Page 40
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