An AT45D021 2Mbit dataflash is included on the STK500 for non-volatile data storage. A dataflash is a high-density flash memory with SPI serial interface. Detailed datasheet of the dataflash can be obtained from the Microchip web site.
The dataflash can be connected to the I/O pins of the microcontroller sockets. The 4-pin header marked "DATAFLASH" can be used for connecting the SPI interface of the dataflash to the I/O pins on the target Atmel AVR microcontroller in the socket. 2-wire cables are included with STK500 for connecting the dataflash to the I/O pins. The supplied 10- wire cables can also be used if the dataflash is connected to the hardware SPI interface on PORTB of the AVR microcontroller.
The block schematic of the dataflash connection is shown below, for connection of the dataflash to the AVR hardware SPI interface.
The SPI interface pinout is shown here.
