公开(公告)号：US20080155289A1

公开(公告)日：2008-06-26

申请号：US12046321

申请日：2008-03-11

申请人： KENNETH W. FERNALD ,  DONALD E. ALFANO

发明人： KENNETH W. FERNALD ,  DONALD E. ALFANO

IPC分类号： G06F1/32 ,  G06F1/14

CPC分类号： G06F1/3203

摘要： 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.

摘要翻译： 公开了具有独立实时时钟（RTC）的微控制器单元（MCU）。 MCU包括用于接收数字信息并处理所接收的数字信息的处理电路。 主时钟电路为处理电路提供定时。 电源控制电路控制处理电路和主时钟电路的电源，以控制其工作在至少全功率模式下工作，从供电电压输入和低功耗模式绘制小于全功率模式 功率电平从电源电压输入。 还提供独立的RTC电路，独立的RTC电路包括独立于主时钟电路工作的RTC时钟电路。 由RTC时钟电路计时钟的定时器可操作以增加存储的时间值以便从其输出，RTC时钟电路具有确定的时基。 输入/输出（I / O）设备提供处理电路对定时器输出的结果的访问。 电源管理电路管理独立RTC电路的电源，使得RTC时钟电路，定时器和I / O设备无论处理电路和主时钟电路的功率工作模式如何都工作。

公开(公告)号：US20080270817A1

公开(公告)日：2008-10-30

申请号：US12166229

申请日：2008-07-01

申请人： KARTIKA PRIHADI ,  KENNETH W. FERNALD

发明人： KARTIKA PRIHADI ,  KENNETH W. FERNALD

IPC分类号： G06F1/12

CPC分类号： H03L1/022 ,  G06F1/08 ,  H03K3/0231

摘要： A precision oscillator for an asynchronous transmission system. An integrated system on a chip with serial asynchronous communication capabilities includes processing circuitry for performing predefined digital processing functions on the chip and having an associated on chip free running clock circuit for generating a temperature compensated clock. An on-chip UART is provided for digitally communicating with an off-chip UART, which off-chip UART has an independent time reference, which communication between the on-chip UART and the off-chip UART is effected without clock recovery. The on-chip UART has a time-base derived from the temperature compensated clock. The temperature compensated clock provides a time reference for both the processing circuitry and the on-chip UART.

摘要翻译： 用于异步传输系统的精密振荡器。 具有串行异步通信能力的集成在芯片上的系统包括处理电路，用于在芯片上执行预定义的数字处理功能，并具有相关的片上自由运行时钟电路，用于产生温度补偿时钟。 提供片上UART，用于与片外UART进行数字通信，该片外UART具有独立的时基参考，片上UART和片外UART之间的通信无需时钟恢复即可实现。 片内UART具有源自温度补偿时钟的时基。 温度补偿时钟为处理电路和片上UART提供时间参考。