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Hardware Description
3.6
Description of
DataFlash Pins
NB! No t 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)
1 2
PB1
PB0
PB3
PB2
PB5(MOSI)
(SS)PB4
PB7(SCK)
(MISO)PB6
VTG
GND
Figure 3-12. PORTB SPI Pinout (28-pin Analog Parts)
1 2
3-6
1925C–AVR–3/03
PB0
(SS)PB2
(MISO)PB4
PB6
GND
PB1
PB3(MOSI)
PB5(SCK)
PB7
VTG
AVR STK500 User Guide
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