ATMEL AT91SAM7S256 PDF

Vudojar This pin could also be pulled permanently to GND. The foregoing information relates to product sold on, or after, the date shown below. Typical Operating Supply Voltage. The product does not contain any of the restricted substances in concentrations and applications banned by the Directive, and for components, the product is capable of being worked on at the higher temperatures required by lead—free soldering. Peripheral Simulation You have chosen to save the following item to a parts list:. The logic state of the Erase pin can be changed by means of a jumper.

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It must be loaded into the first sector of Flash memory so that it will boot when power is switched on. This will overwrite any user program that exists in the Flash memory. This will typically be done with a jumper on the microcontroller board. The board must then be powered up for 10 seconds. Hardware Requirements In order for the boot loader to work, there are some hardware requirements that must be met on the microcontroller circuit: The USB microcontroller pins must be connected to a USB connector.

An The TST pin needs to be connected to a jumper to be able to pull it high. If PA0 to PA2 are left unconnected, the default internal pull-up resistors will place a high on these pins. It is possible to leave this pin disconnected or dedicate it to some other use and put a permanent 1k5 pull-up resistor on the DDP pin. It is suggested to do this only if PA16 is required for some other use and the USB port is dedicated to updating the microcontroller software.

The TST pin is pulled low by an internal 15k resistor. It may be preferable to add a stronger external pull-down resistor such as a 4k7 resistor.

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