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CH341H Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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CH341H Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers |
8 / 14 page The DataSheet of CH341 (the first) 8 07H~06H PID Product ID, high byte is behind, any value 55??H 09H~08H RID Release ID, high byte is behind, any value 0100H 17H~10H SN Serial number, the size is 8 12345678 DID Printer port: defined printer device ID string accord IEEE-1284 7FH~20H PIDS Serial interface or printer port: production explanation string of un-printer 00H, 00H Others (Reserved unit) 00H or FFH The following table is CFG defining detail configuration, explanation is according bit. Bit address Shortened form Explanation Default value 7 PRT Select communication interface: for serial interface, the value must be 1 For un-serial interface select: 0=standard USB printer port; 1=parallel interface 1 6 PWR USB device supply power mode: 0=peripheral and USB; 1=USB bus only 1 5 SN-S Production serial number string: 0=valid; 1=invalid 1 DID-S Printer’s device ID string:0=valid; 1=invalid 1 4 PID-S Product explanation string of un-printer: 0=valid; 1=invalid 1 3 SPD Data transfer speed of printer port:0=high-speed; 1=low-speed/standard 1 2 SUSP Automatically suspend and low-cost when USB is not busy, 0=forbid; 1=allow 1 1 0 PROT Define interface protocol in configuration description sign of USB device: for serial or parallel interface, the valid value is 0 to 3, 0 is recommended, For standard USB printer port: the valid value is 1 and 2, 2 is recommended 1 0 5.4.Asynchronous serial interface In the asynchronous serial mode the CH341’s pins contain: data transfer pin, hardware speed control pin, operation state pin, MODEM communication signal pin and assistant pin. Data transfer pin consists: TXD and RXD pins. When serial interface is leisure TXD and RXD are high-level. Hardware speed control pin consists: TEN# and RDY#. TEN# is serial interface transfer enable, when it is high-level, CH341 will stop transfer data from serial interface. Until it is low-level, CH341 will go on transferring data. RDY# is serial interface receive ready. When it is high-level indicate CH341 is not ready to receive data, maybe the chip is reset, USB is un-configure, cancel configuration or serial interface receive buffer is full etc. Operation state pins consist: TNOW and ROV# pins. TNOW with high-level indicates CH341 is transferring data from serial interface. When the transfer is completed the TNOW is low-level. TNOW can indicate serial interface receive and transfer switch state in semi-duplex serial interface mode. ROV# indicates CH341 internal serial interface receive buffer will overflow or have overflowed and the following data will discard. In common, the receive buffer is not overflow, so the ROV# is high-level. MODEM communicate signal pins consist: CTS#, DSR#, RI#, DCD# , DTR# and RST# pin. All the MODEM communication signals are controlled and defined by computer applied program, not directly |
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