Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 3)

AT8xC5122/23

4202E–SCR–06/06

Product Description AT8xC5122/23 products are high-performance CMOS derivatives of the 80C51 8-bit

microcontrollers designed for USB smart card reader applications.

The AT8xC5122 is proposed in four versions :

- ROM version with or without internal data E2PROM. The ROM device is only factory

programmable.

- CRAM version without internal data E2PROM. The CRAM device implements a vola-

tile program memory which is programmed by means of an embedded ROMed

bootloader which transfers the code from a remote software programming tool called

FLIP through UART or USB interfaces.

- Flash version without internal data E2PROM. At power-up, the program located in the

flash memory is transferred into the CRAM then executed.

The AT83C5123 is a low pin count of the AT8xC5122 and is proposed in ROM version

with or without internal data E2PROM. The ROM device is only factory programmable.

The AT8xC5122DS is a secure version of the AT8xC5122 on which the external pro-

gram memory access mode is disabled.

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