2

4247DS–SCR–03/07

AT83C21GC

The connection with the host processor is achieved via a serial asynchronous link; the rate can

be selected from a range from 1200 to 115,200 bps.

The software inside the GemCore chip handles a communication protocol with the host system

called the Gemplus Block Protocol (GBP).

A c o m p l e t e s e t o f d o c u m e n t a t i o n i s a v a i l a b l e o n t h e G e m p l u s w e b s i t e :

http://www.gemplus.com.

A GBP Interface Library Kit can be provided, upon request. It consists of the source code of the

GBP communication layer between the host and GemCore. It is written in the C language. See

the Gemplus developers’ site at www.gemplus.com. Enquiries can also be posted to

cardreader@atmel.com.

For general information on the device, please refer to the AT83C5121 datasheet available on

the Atmel web site, www.atmel.com.