2011年_嵌入式试卷A卷及答案

UBRDIV0 UBRDIV1 UBRDIV2 UBRDIVn UBRDIV 0x50000028 0x50004028 0x50008028 Bit [15:0] R/W R/W R/W Baud rate divisor register 0 Baud rate divisor register 1 Baud rate divisor register 2 - - - Initial State - Description Baud rate division value UBRDIVn>0 答：根据UBRDIVn=(int)(PCLK/(bps x 16))-1有

寄存器UBRDIV0=(int)(40000000/(2400*16))-l= 1040 = 10000010000(B) 寄存器UBRDIV1=(int)(40000000/(115200*16))-1= 20 =10100(B)