描述
定时器的精度与程序的安排有关，如果定时器的触点在线圈之前，精度将会降低。平均误差约为1.5倍扫描周期。最小定时误差为输入滤波器时间减去定时器的分辨率，1ms，10ms和100ms定时器的分辨率分别为1ms，10ms和100ms。
如果定时器的触点在线圈之后，最大定时误差为2倍扫描周期加上输入滤波器时间。如果定时器的触点在线圈之前，最大定时误差为3倍扫描周期加上输入滤波器时间。
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