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CH341A Datasheet(PDF) 14 Page - List of Unclassifed Manufacturers

No. de Pieza. CH341A
Descripción  CH341 is a USB bus convert chip, providing UART, printer port, parallel and synchronous serial with 2-wire or 4-wire through USB bus
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Fabricante  ETC2 [List of Unclassifed Manufacturers]
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CH341A Datasheet(HTML) 14 Page - List of Unclassifed Manufacturers

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The DataSheet of CH341 (the first)
The picture realizes USB communication between MCU and computer through serial interface
MPU/MCU connects to CH341.
The baud rate of serial interface is high or MCU is too busy to receive, then any output pin of MCU can
control TEN# of CH341. When MCU is idle and can receive data set TEN# as low-level. When MCU is
busy or not convenient to receive serial interface data set TEN# as high-level to make CH341 pause to send
next byte, realize controlling speed.
7.7.Serial interface connection (consult the following picture)
RDY# of the second side connects to TEN# of the opposite side. The opposite side can transfer data
until the second is ready. No matter what the serial interface communication speed, the two sides can keep
data synchronous avoid to loss data. If the serial interface communication speed is high or the speed of two
sides do not match or low speed MCU connects to CH341 serial interface, use hardware to control signal to
ensure data synchronous.

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