Analog Devices ADZS-U4050LF-EZKIT, Руководство пользователя

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ADZS-U4050LF-EZKIT User Guide UG-1163
Rev. 0 | Page 7 of 31
USB to UART Interface
The ADZS-U4050LF-EZKIT has an on-board USB to UART
interface circuit used to connect the
ADuCM4050 microcon-
trollers to a PC. The USB to UART functionality is provided by
an FT232RQ (U4) chip. The chip handles the entire USB protocol
on-chip and no USB firmware development is required. The
FT232RQ can transfer data at rates from 300 baud to 3 Mbaud at
transistor to transistor (TTL) levels.
The ADuCM4050 microcontroller UART0 pins are connected
directly to the interface pins of the FT232RQ chip (U4). If another
USB to UART module is used, the UART1 signals can be tapped
on the P7 4 × 1 header.
mbed Interface
mbed is a platform based on Cortex-M that features several
components including an operating system and protocols. One
of these components is the programming interface CMSIS-DAP
compliant.
The ADZS-U4050LF-EZKIT board has a programming interface,
which enables the device to be programmed and debugged via
USB. When connected to a PC, an external unit called DAPLINK
and a new COM port appears; if not, installing the mbed
Windows® serial port driver is required. For further information,
see the ARM mbed web page.
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Figure 5. USB to UART Circuit (Right) and USB to mbed Circuit (Left)