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Hardware Description

3-6

AVR STK500 User Guide

1925C–AVR–3/03

3.6

Description of

DataFlash Pins

NB! Not valid: AT45D021 2-Mbit DataFlash is included on the STK500 for data storage.

A DataFlash is a high-density Flash memory with SPI serial interface. A detailed

datasheet of the DataFlash can be obtained from the Flash memory section of the Atmel

CD-ROM or from the Atmel 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 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 inter-

face on PORTB of the AVR microcontroller. The connection of the I/O pins is shown in

Figure 3-13. The block schematic of the DataFlash connection is shown in Figure 3-14,

for connection of the DataFlash to the AVR hardware SPI interface. The SPI interface

pinout is shown in Figure 3-11 and Figure 3-12.

Figure 3-11. PORTB SPI Pinout (40-pin Parts)

Figure 3-12. PORTB SPI Pinout (28-pin Analog Parts)

PB1

PB3

PB5(MOSI)

PB7(SCK)

VTG

PB0

PB2

(SS)PB4

(MISO)PB6

GND

1 2

PB1

PB3(MOSI)

PB5(SCK)

PB7

VTG

PB0

(SS)PB2

(MISO)PB4

PB6

GND

1 2

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