The invention discloses a circuit structure for a counter and an electronic device applied to the circuit structure for the counter. The circuit structure for the counter and the electronic device are suitable for calculating the periodicity of one digital signal relative to one frequency signal, wherein the signal modal of the digital signal is a nonreturn-to-zero code. The circuit structure forthe counter comprises a first counter module and a second counter module, wherein the first counter module receives the digital signal and the frequency signal; when the digital signal is in a high level, the first counter module calculates the periodicity of the signal width of the digital signal relative to the frequency signal; the second counter module receives an inverted signal of the digital signal and the frequency signal; and when the inverted signal of the digital signal is in a high level, the second counter module calculates the periodicity of the signal width of the inverted signal of the digital signal relative to the frequency signal. The counter circuit has a simplified structure, reduces the use amount of the components of a logic circuit, further reduces the occupied area of the circuit structure, lowers the power consumption, and facilitates the application of the integrated circuit.