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1.4.
3-pin interface header
Header H1 enables the user to interface directly with the Atmel ATSHA204 IC with an external
microcontroller Figure 1-5. At power-up, PD3 (onboard AVR) is tri-stated and therefore will not interfere
with the external microcontroller driving the SIG line. Although not necessary, R8 can be removed to
eliminate any possibility of drive contention on the SIG line between the PD3 and an external
microcontroller.
Figure 1-5.
3-pin interface header schematic
2.
RESET
Although the Atmel AT90USB162 has its on-chip RESET circuitry, (c.f. Atmel AT90USB162 datasheet,
section “System control and reset”), th e AT88CK454BLACK provides two additional means to reset the
AT90USB162.
?
?
Power-on RESET: The on-board RC network acts as power-on RESET
RESET Push Button (S1): The Atmel AT88CK454BLACK is shipped without S1 mounted. Once S1 has
been mounted, it provides the Atmel AT88CK454BLACK with the option to perform a warm RESET of
the Atmel AT90USB162 AVR. See bill of material S1 part number.
mkII and AVRISP mkII via AVR Studio . It includes a number demonstration program with source and hex
4
3.
4.
5.
Debugging
The AT90USB162 debugWIRE is not accessible on the AT88CK454BLACK and therefore not suitable for
code development. It is recommended that firmware development be done with the Atmel STK526 or the
Atmel STK600 routing card (STK600-RC032U-20) and the socket card (STK00-TQFP32).
The Atmel STK526 starter kit is dedicated to the AT90USB82/162 microcontrollers. It supports JTAGICE
?
files. The parts can be directly programmed through the USB port with FLIP in-system programming
utility.
Firmware Upgrade
See application note doc8746, “ Upgrading Crypto Kits Firmware. ”
References and further information
Schematics, Gerber files, bill of materials (BOM), development and demonstration software is conveniently
downloadable from the Atmel website at www.atmel.com/cryptokits .
At mel AT88CK454BLACK Hardware User Guide
8737A – SMEM – 3/11
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