Patent ID: 8099621

Claim:
A data reception apparatus comprising: an oscillation circuit including a CR oscillator, wherein the CR oscillator outputs an oscillation signal, the oscillation circuit multiplies or divides the oscillation signal based on a cycle setting value, and the oscillation circuit outputs a clock signal corresponding to the multiplied or divided oscillation signal; a temperature detector that detects a temperature around the CR oscillator; a memory that stores the cycle setting value in association with the temperature; a clock cycle setting element that reads the cycle setting value corresponding to the temperature from the memory, and inputs the cycle setting value into the oscillation circuit; a receiver that receives a data signal defined by the clock signal; a measurement element that measures a unit bit length of the data signal by counting the clock signal; and a correction element that corrects the cycle setting value corresponding to the temperature based on a count value of the clock signal and a reference count value of a reference cycle corresponding to the unit bit length, and rewrites the cycle setting value with the corrected cycle setting value in association with the temperature in the memory.