초록 ▼

An improved clocking system for micro controllers is provided. The micro controller has two mechanisms by which the clocking is provided. One clock is provided by an external clock signal which is generally crystal controlled. A second mechanism for providing the clock is also present. This second c

An improved clocking system for micro controllers is provided. The micro controller has two mechanisms by which the clocking is provided. One clock is provided by an external clock signal which is generally crystal controlled. A second mechanism for providing the clock is also present. This second clock can be useful as the "primary" or first clock which is generally a crystal oscillator may take several milliseconds to stabilize following a restart from a stop mode. The second clock mechanism can for example be an internal ring oscillator or other type of clock which although not as accurate as a crystal clock does not require the several milliseconds to recover.

대표청구항 ▼

[ What is claimed is:] [1.] A microcontroller clocking system comprising:an input to accept a crystal controlled oscillator;a means for said microcontroller to accept a stop signal;a second oscillator separate from said crystal oscillator for providing a clock signal to said microcontroller in respo

[ What is claimed is:] [1.] A microcontroller clocking system comprising:an input to accept a crystal controlled oscillator;a means for said microcontroller to accept a stop signal;a second oscillator separate from said crystal oscillator for providing a clock signal to said microcontroller in response to the receipt of said stop signal for a period of time after the removal of said stop signal.