The DataSheet of CH341 (the first)

2

2.2. UART

● Simulate standard serial used to upgrade serial peripheral equipment or increase extra serial via USB.

● Totally compatible with serial application program of computer Windows operation system.

● Hardware full-duplex serial, on-chip transform and receive buffer, supports 50bps~2Mbps

communication baud rate.

● Supporting five, six, seven or eight data bits, supporting odd, even, blank, token and no check.

● Supporting serial transfer and receive enable and serial receive ready etc transfer speed control signal

and MODEM liaison signal.

● Providing RS232, RS485 and RS422 interface through adding level switch equipment external.

● Supporting indirectly access to outside serial EEPROM memory through standard serial

communication.

2.3. Printer port

● Standard USB printer port used to upgrade parallel printer, conforms to relevant USB specification.

● Compatible with Windows operation system, totally compatible with application program under

Windows 2000 and XP without drive program.

● Supports various standard parallel printers, low-speed and high-speed print mode are optional.

● Supports bi-directional communication of IEEE-1284 specification, supports single directional and

bi-directional transfer printer.

2.4. Parallel

● Providing two interface mode: EPP and MEM.

● EPP mode supplies AS#, DS# and WR# etc signal, similar with EPP V1.7 or EPP V1.9.

● MEM mode supplies A0, RD# and WR# etc signal, similar with memory read/write mode.

2.5. Synchronous serial

● Adopts FlexWireTM technology, realize various 2-wire to 5-wire synchronous serial via software.

● As Host/Master endpoint, supports 2-wire and 4-wire etc common synchronous serial.

● 2-wire interface supplies SCL and SDA signal wire, supports four kinds of transfer speed.

3. Package