Micro-processor unit having universal asynchronous receiver/tran

Details Micro-processor unit having universal asynchronous receiver/tran Micro-processor unit having universal asynchronous receiver/tran

1995-09-06

1998-01-27

Auve, Glenn A.

395560, G06F 132

Patent

active

057130280

ABSTRACT:
A UART (Universal Asynchronous Receiver/Transmitter) is used to interface serial data signals, and is provided to associate with a micro-processor in a micro-processor unit. The micro-processor unit is required to save consumption of power, if employed in such devices as a handy terminal device or the like. The micro-processor unit that can save consumption of power includes a microprocessor having a core section, which performs an arithmetic operation, and a universal asynchronous receiver/transmitter section operatively connected to the core section of the micro-processor. The universal asynchronous receiver/transmitter has a first circuit for receiving an asynchronous serial data signal, which is composed of a start bit, a stop bit and data bits provided between the start and stop bits. The first circuit also detects the start bit. Also included in the universal asynchronous receiver/transmitter is a second circuit for setting a flag indicating that the asynchronous serial data signal is being received when the start bit is detected by the first. When the micro-processor detects that the flag is set, stops the supply of clocks to the core section in a sleep mode.

REFERENCES:
patent: 5392437 (1995-02-01), Matter et al.
patent: 5418969 (1995-05-01), Matsuzaki et al.
patent: 5452434 (1995-09-01), MacDonald
patent: 5546590 (1996-08-01), Pierce

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