Method of correcting a real-time clock of an electronic apparatus

摘要

A method of correcting a real-time clock of an electronic apparatus, notably a mobile telephone, in which the real-time clock operates with a first clock generator which generates a real-time clock while the electronic apparatus operates with a second clock generator which generates a system clock, which method includes the following steps:determining the actual frequency of the real-time clock,determining the ratio V_{clock/standard} of the actual frequency of the real-time clock to the reference frequency of a standard clock,determining the deviation time of the real-time clock per second from the difference (1−V_{clock/standard}),determining, on the basis of the deviation time per second, a time difference dt within which the real-time clock is to be corrected by a correction time difference Δt,correcting the real time by Δt after expiration of dt.