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AT88SCK109STK3
3.12
3.13
Interfacing a USART with CryptoAuthentication
A microcontroller’s USART requires a minimum of two signals (RXD and TXD) to communicate.
The AT88SA100, AT88SA102, and AT88SA10HS devices have a 1-wire communication interface.
The make the USART compatible with a 1-wire CryptoAuthentication device, the USART’s pins (TX
and Rx) are tied together.
Figure 19. USART TXD and RXD pins configured for 1-wire Interfacing
On the AT88CK109BK3, Px2 and Px3 are tied together with a zero ohm resistor (R11). When
mounted to the AT88Microbase, pins Px2 and Px3 align with pins (PB3/PD2) and (PB7/PD3). The
USART pins, PD2 (RXD) and PD3 (TXD), are effectively tied together with R11allowing the USART
to be compatible with the CryptoAuthentication 1-wire interface.
In-System Programming
3.13.1 Programming with USB bootloader: DFU (Device Firmware Upgrade)
AT90USB1287 AVR comes with a default factory pre-programmed USB bootloader located in the
on-chip boot section of the AT90USB1287. This is the easiest and fastest way to reprogram the
device directly over the USB interface. The “Flip” PC side application, available for free on Atmel
website, offers a flexible and user friendly interface for reprogramming the application over the USB
bus.
The “HWB” push button is used to place the AVR into DFU mode after reset (Refer to
AT90USB1287 datasheet section “boot loader support”).
The following steps enable the DFU mode:
1. Press and hold “HWB” button
2. Press the “RESET” button
3. Release the “RESETT” button.
4. Release the “HWB” button.
For more information about the USB bootloader and FLIP software, please refer to the ‘USB
bootloader datasheet’ document and ‘FLIP User Manual’.
Note: HWBE fuse must be enabled to support DFU.
3-16
8699A—CRYPTO—10/09
AT88CK109STK3 User Guide
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相关代理商/技术参数
AT88CK109STK8 功能描述:安全/ 验证开发工具 CryptoAuth Strtr Kit w/2 SOIC sockets RoHS:否 制造商:Digi International 产品:Development Kits 工具用于评估:XEB-AW140 接口类型:SPI, USB 工作电源电压:3.1 V to 3.6 V
AT88CK109STK8-PROMO 制造商:Atmel Corporation 功能描述:CRYPTOAUTHENTICATION EE, START
AT88CK109-TSU-XPRO 制造商:Atmel Corporation 功能描述:BOARD KIT CRYPTO W/2 SOIC SKTS
AT88CK201BK 功能描述:子卡和OEM板 Modular CryptoRF startr kit w/o micro RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
AT88CK201STK 功能描述:安全/ 验证开发工具 Modular Starter Kit for CryptoRF w/micro RoHS:否 制造商:Digi International 产品:Development Kits 工具用于评估:XEB-AW140 接口类型:SPI, USB 工作电源电压:3.1 V to 3.6 V
AT88CK301ADP 功能描述:插座和适配器 CryptoProducts 10pin header adapter kit RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
AT88CK427GREEN 功能描述:存储器 IC 开发工具 AES Memory Demo Kit RoHS:否 制造商:STMicroelectronics 产品:Reference Boards 工具用于评估:M24LR64-R 存储容量:64 kbit 存储类型:EEPROM 工作电源电压:1.8 V to 5.5 V
AT88CK440RED 功能描述:安全/ 验证开发工具 CryptoProducts 10pin header adapter kit RoHS:否 制造商:Digi International 产品:Development Kits 工具用于评估:XEB-AW140 接口类型:SPI, USB 工作电源电压:3.1 V to 3.6 V