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CCS仿真環境中，2812的TxPR寄存器的值更新會受TxCON里最高位（free位，為0表示仿真掛起會使計時停止，為1則計時不受掛起影響）影響。而TxCMPR里的值不受該位影響。如下面的程序代碼：
EvaRegs.T2PR = 0x0080;
EvaRegs.T2CMPR = 0x0040;
EvaRegs.T2CON.all = 0x1546; // Free = 0
EvaRegs.T2PR = 0x0090;
EvaRegs.T2CMPR = 0x0x0050;
執行后T2PR = 0x0080; T2CMPR = 0x0x0050;
將TxCON里free位改為1：
EvaRegs.T2PR = 0x0080;
EvaRegs.T2CMPR = 0x0040;
EvaRegs.T2CON.all = 0x9546; // Free = 1
EvaRegs.T2PR = 0x0090;
EvaRegs.T2CMPR = 0x0x0050;
執行后T2PR = 0x0090; T2CMPR = 0x0x0050;
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