Patent ID: 8368565
Filing Date: 2013-02-05
Classification: H03M

Abstract:
1. A power saving method in a sleep mode, the method being adapted for a triangular-type scan keyboard controller comprising a plurality of input/output (I/O) pins, the method comprising the steps of: providing a first clock source; providing a second clock source; sequentially outputting a scan pulse from the I/O pins according to the frequency of the first clock source in a normal mode, wherein when a specific one of the I/O pins outputs the scan pulse, the other I/O pins are used for detecting; and sequentially outputting the scan pulse from the I/O pins according to the frequency of the second clock source in the sleep mode, wherein when a specific one of the I/O pins outputs the scan pulse, the other I/O pins are used for detecting, wherein the triangular-type scan keyboard controller further comprises a scan driving unit and at least one function block, wherein the scan driving unit drives the I/O pins to output the scan pulse, and the method further comprises the step of: disabling the function block and only holding the scan driving unit in an operating state in the sleep mode.