| 摘要 |
PROBLEM TO BE SOLVED: To provide a DLL (Delay Locked Loop) that can preclude the possibility of imposing an increased load due to interruption processing applied to a DSP(Digital Signal Processor) caused by an increased number of interruption processing times to the DSP without the need for complicating the hardware configuration and for increasing the size of the hardware configuration and to provide a synchronization tracing method. SOLUTION: The DLL, which takes correlation between a spread sequence signal whose phase is advanced from that of a spread sequence signal used for demodulating a received signal subjected to spread processing and a spread sequence signal whose phase lags from that of the spread sequence signal used for demodulating the received signal, conducts loop filter processing by using the result of correlation, and revises an oscillated frequency used for production of all of the spread sequence signals on the basis of an output of the loop filter processing, is provided with a DLL register 123 that stores the result of correlation, the DSP 120 that receives the stored result of correlation, applies the loop filter processing thereto, and outputs a control signal of the oscillated frequency, and a DLL interruption selecting block 124 that applies interruption processing to the DSP 120 in prescribed timing of a communication channel at data communication at least after synchronization acquisition and allows the DSP 120 to capture the stored result of correlation. |
