These are an initial Power On detect circuit, which also can be used as a time keeping failure detect, a low battery detect circuit, ... On initial power up the Oscillator Fail Flag will be set to a one and the real time clock start bit reset to a zero. ... This bit is set only when the clock is operating under the Vcc pin, and when the battery voltage is determined to be less than 2.1V (typical). ... Each timer is composed of a 16-bit negative edge triggered binary down counter and associated control.
Title | : | Real Time Clock Handbook |
Author | : | |
Publisher | : | - 1993 |
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