| 摘要 |
In order to reduce current consumption in a mobile telephone, a slow clock signal is used while the mobile is in a standby state. The circuit providing the slow clock signal is calibrated by the circuit providing the fast clock signal before it is deactivated. Data received from the network is used to determine a known period of time delta between a first date T<SB>0</SB> and second date T<SB>1</SB>. The number of time periods of the fast clock during one period of the slow clock N is determined. A value of the duration delta is divided by the number N and a number M is obtained, M comprises an integer part E and a decimal part D. m periods are counted with the fast clock signal, where m<n with n equal to D x N, between the date T<SB>0</SB> and a first edge of the slow clock signal after the date T<SB>0</SB>. A value r of the remainder of the subtraction between m and n is stored in the data memory of the mobile. The mobile is then placed in a standby state, E periods are counted with the slow clock signal, r periods are counted with a fast clock signal. The mobile is subsequently placed in an active state. |
