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如何使用Low Power UART(LP UART)波特率补偿? 日期:2018-01-16
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使用者可以在BRCOMP(UART_BRCOMP[8:0])设定需要补偿的位,并且在BRCOMPDEC(UART_BRCOMP[31])设定正补偿或是负补偿,使所设定的位数据时间增加或减少1个UART时钟。
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Low Power UART寄存器
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范例如下
UART peripheral clock = 32.768K (LXT)
UART Baud rate = 9600, 1bit = 104.167us
原波形会依3个UART时钟的时间表示1个位的UART数据 ( (1 / 32.768K) * 3 = 91.55us),波形如下:
设定补偿寄存器如下:
BRCOMP[8:0] = 0x0010100101
BRCOMPDEC[31] = 0
在bit0, bit2, bit5, bit7会补偿1个UART时钟的时间 = ( (1 / 32.768K) * 4 = 122.07us)
波形如下:
开启补偿功能可以控制UART波特率的误差在± 0.5个UART时钟的时间以内。
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功能: | Peripherals,ARM,Cortex-M4,Connectivity,UART |