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The AT76C713 is a low-power, high performing USB 2.0 full-speed microcontroller providing advanced features for USB peripherals. It combines a number of functions required in such a device, including the following:

• The device is based on the AVR-enhanced RISC architecture core, which combines an advanced instruction set with 32 general-purpose working registers. By executing powerful instructions in a single clock cycle, the AT76C713 achieves throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize the power consumption versus the processing speed.

• The clock generation circuit requires a clock input of 12 MHz and provides standard clock rates for the USB module and the on-chip UARTs, as well as several AVR CPU rates varying from 16 MHz up to 48 MHz.

• Internal DMA channels allow fast data transfers between the USB buffers and the external or the on-chip memory without processor interruption. USB DMA transfers use devoted data paths with 12 Mbytes/s transfer rate.

• An on-chip flexible memory controller allows dynamic memory mapping and provides the required timing for interfacing with slow or fast external memory devices, like SRAM or FIFOs.

• Five multipurpose I/O ports, PORT(A-E), provide the signals for all the serial and parallel interfaces. Programmable strobe signals are provided for external FIFO access. In addition, the AT76C713 supports various power-down modes and offers four external interrupts, a programmable watchdog timer, and flexible timer/counters with compare modes.

• On power-up, the bootstrap code is executed from the boot ROM. The purpose of the bootstrap code is to load the application code into the program memory. The application code is executed from the on-chip SRAM program memory, contributing to the low-power consumption. Different programming modes are supported, depending on the application (that is, the mode is selected externally by the PMODE0 and PMODE1 pins).

• In the slave programming mode, an external system (that is, the Host), operating as SPI master, can transfer the program image in a raw format to the program memory of the device. In this case, the AT76C713 operates as an SPI slave and starts running from the internal boot ROM code, which switches to the start of program memory when it detects the end of a valid program transfer from the host to the AT76C713.

• In the master programming mode, the AT76C713 reads the whole program image from an external serial EEPROM or DataFlash and switches to the start of the program memory when it completes this reading. Alternatively, the AT76C713 reads only configuration parameters from a small serial non-volatile memory (EEPROM or DataFlash), enables the USB Controller, and executes the USB Device Firmware Upgrade (DFU) code stored in the boot ROM.

• The USB Controller consists of a Serial Interface Engine (SIE), a Function Interface Unit (FIU), and a System Interface (SI). The SIE performs bit processing, line coding, packet generation, packet type recognition, serial-parallel data conversion, and packet delineation. The FIU consists of a protocol engine and a USB device with one Control Endpoint (EP0) and seven programmable Endpoints with up to 512 bytes maximum total size. All Endpoints support double buffering in order to provide the maximum performance specified for the USB.

• The AT76C713 supports two 16550 UART modules with 16 bytes FIFOs in each direction. UART0 serial interface provides full modem control functionality with the RTS/CTS, DTR/DSR, RI, and CD signals. These signals are provided by the general-purpose I/O pins of PORTD.
X9400 X9400
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X9400WS24-2.7 X9400WS24-2.7
X9400WS24I X9400WS24I
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