Atmel is known in the hobby world mostly for AVR microcontrollers like the ATmega8 used in the Arduino boards. These are grand little chips, and a lot of fun to play with. What is often overlooked, though, is that Atmel makes a lot of other chips. This includes CPLD devices, memories, thumbprint scanners and controllers using other architectures. One in particular is ARM, which seems to be all over the place these days. I was digging around the Atmel website for their ARM-based chips, and ran across the page for the AT91SAM7S chip. This page has on it an architecture reference manual for the ARM7TDMI core, as well as a checklist for engineers. This wonderful little doc covers power supply, decoupling capacitors, clock signal, everything. The basics needed to wire up this chip and get it running in a bare-bones configuration. Very worth a visit.