Micro controller unit (MCU) with RTC

Details Micro controller unit (MCU) with RTC Micro controller unit (MCU) with RTC

2008-03-11

2008-03-11

Cao, Chun (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C327S291000

Reexamination Certificate

active

10881793

ABSTRACT:
A microcontroller unit (MCU) is disclosed with a stand-alone Real Time Clock (RTC). The MCU includes a processing circuit for receiving digital information and processing said received digital information. A primary clock circuit provides the timing for the processing circuit. A power control circuit controls the power to the processing circuit and the primary clock circuit to control the operation thereof to operate in at least a full power mode drawing a full power level from a supply voltage input and a reduced power mode drawing less than the full power level from the supply voltage input. A stand-alone RTC circuit is also provided, the stand-alone RTC circuit including an RTC clock circuit operating independent of the primary clock circuit. A timer clocked by the RTC clock circuit is operable to increment a stored time value for output therefrom, the RTC clock circuit having a defined time base. An input/output (I/O) device provides access by the processing circuit to the results output by the timer. A power management circuitry manages the power to the stand-alone RTC circuit, such that the RTC clock circuit, the timer, and the I/O device operate regardless of the power mode of operation of the processing circuitry and the primary clock circuit.

REFERENCES:
patent: 6021501 (2000-02-01), Shay
patent: 6067627 (2000-05-01), Reents
patent: 6194940 (2001-02-01), Hunter et al.
National Semiconductor, DP8573A Real Time Clock (RTC), May 1993.
National Semiconductor, NS486SXF Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems, Feb. 1997.

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