Patent ID: 6809634
Filing Date: 2004-10-26
Classification: B06B,G06F,H03K

Abstract:
A buzzer-driving apparatus for driving a buzzer by using a signal generated by a microprocessor comprising:a free running timer counting a clock of said microprocessor; a register storing a set value thereto; an output port for outputting a signal generated based on the value; when said value is set in said register, an output of said output port is set to a low-level potential and a value counted by said free running timer is reset; when said value counted by said free running timer is equal to said set value, said output of said output port is inverted and said value counted by said free running timer is reset; and comparing said value counted by said free running timer with said value, repeating said comparing step and outputting a signal to said output port to drive said buzzer by using said signal.