Patent ID: 8724663

Claim:
An implementation method for information transmission, comprising: notifying, by a smart card, a main control device of an operating mode supported thereby; receiving, by said smart card, a clock frequency returned by said main control device, wherein said returned clock frequency is determined by said main control device according to said notified operating mode, and when said main control device determines that said smart card supports an externally provided clock frequency according to the operating mode notified by said smart card, the clock frequency returned by said main control device is a second clock frequency, wherein said second clock frequency is higher than a default first clock frequency supported by said smart card; and judging, by said smart card, whether said smart card itself can support said second clock frequency returned by said main control device, if true, said smart card and said main control device carry out information transmission on the basis of a clock control signal of said second clock frequency; otherwise said smart card carries out frequency division on the clock control signal of said second clock frequency, and obtains a clock control signal of said first clock frequency, and the information transmission is carried out by said smart card based on the clock control signal of said first clock frequency and by said main control device based on the clock control signal of said second clock frequency, respectively.