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MCP2200 Datasheet(PDF) 4 Page - Microchip Technology |
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MCP2200 Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 34 page  MCP2200 DS22228A-page 4 2010 Microchip Technology Inc. 1.1 Supported Operating Systems Microsoft Windows XP(SP2 and later)/Vista/7 operating systems are supported. 1.1.1 ENUMERATION The MCP2200 will enumerate as a USB device after POR. The device enumerates as both a Human Interface Device (HID) for I/O control, and a VCP. 1.1.1.1 HID The MCP2200 enumerates as a HID so the device can be configured and the I/O can be controlled. A DLL is supplied by Microchip that allows I/O control using a custom interface. 1.1.1.2 VCP The VCP enumeration implements the USB-to-UART data translation. 1.2 Control Module The control module is the heart of the MCP2200. All other modules are tied together and controlled via the control module. The control module manages the data transfers between the USB and the UART, as well as command requests generated by the USB host controller, and commands for controlling the function of the UART and I/O. 1.2.1 SERIAL INTERFACE The control module interfaces to the UART and USB modules. 1.2.2 INTERFACING TO THE DEVICE The MCP2200 can be accessed for reading and writing via USB host commands. The device cannot be accessed and controlled via the UART interface. 1.3 UART Interface The MCP2200 UART interface consists of the TX and RX data signals and the RTS/CTS flow control pins. The UART is configurable for several baud rates. The available data formats and baud rates are listed in Table 1-3. 1.3.1 INITIAL CONFIGURATION The default UART configuration is 19200, 8, N, 1. The default start up baud rate can be changed using the Microchip supplied configuration PC tool. The primary baud rates are shown in Table 1-3. Alternatively, a custom configuration tool can be created using the Microchip supplied DLL to set the baud rate, as well as other parameters. See Section 2.0 “Configuration” for details. 1.3.2 GET/SET LINE CODING The GET_LINE_CODING and SET_LINE_CODING commands are used to read and set the UART parameters while in operation. For example, Hyperterminal sends the SET_LINE_COMMAND when connecting to the port. The MCP2200 responds by setting the baud rate only. The other parameters (Data Bits, Parity, Stop Bits) remain unchanged. 1.3.2.1 Rounding Errors The primary baud rate setting (with the rounding errors) are shown in Table 1-3. If baud rates other than the ones shown in the table are used, the error percentage can be calculated using Equation 1-1 to find the actual baud rate. 1.3.3 CUSTOM BAUD RATES Custom baud rates are configured by sending the SET_LINE_CODING USB command, or by using the DLL. See Section 2.0 “Configuration” for more information. TABLE 1-2: UART CONFIGURATIONS Parameter Configuration Primary Baud Rates See Table 1-3 Data Bits 8 Parity N Stop Bits 1 |
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