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lmx2592输出频率输出问题 输出20M到28M有问题,28M到9800M没得问题

dta=dta*3;
while(dta<3550)
{dta=dta*2;}
Writelmx2592_REG(0x1F0601); //R31 /0x1F0401 0x1F0601
Writelmx2592_REG(0x22C3EA); //R34 CHDIV_EN
Writelmx2592_REG(0x23119F); //R35 CHDIV_EN
Writelmx2592_REG(0x240448); //R36 CHDIV 
Writelmx2592_REG(0x2E0FA3); //R46 modulator order OUTA power
Writelmx2592_REG(0x2F00CF); //R47 modulator order OUTA DIV 
Writelmx2592_REG(0x3003FD); //R48 modulator order OUTB VCO 0x3003FD

明明我把R35   CHDIV_SEG1  设置为1   divide-by-3应该为3   但实际输出还是为divide-by-2,读寄存器  R35设置为了0x23119F  是不是设置R35  需要其他配置不能直接写数据??