Patent ID: 7113072
Filing Date: 2006-09-26
Classification: B60R,G07C

Abstract:
1. A semiconductor device for a keyless entry transmitter, the semiconductor device comprising: a command data circuit connected to communication terminals for communication with a microcomputer; a memory circuit connected to the command data circuit for storing rolling code data; a timer period setting register connected to the command data circuit for storing timer period setting data; a timer circuit connected to the command data circuit, the timer period setting register and a clock terminal for outputting an enable signal for placing the microcomputer into an intermittent operation state upon receiving an output signal of the command data circuit, an output signal of the timer period setting register, and a clock signal of the clock terminal; a regulator output voltage setting register connected to the command data circuit for outputting a signal in response to an output signal of the command data circuit; and a regulator circuit connected to the regulator output voltage setting register for outputting an output voltage upon receiving an input voltage and the output signal of the regulator output voltage setting register.