80c51 8-bit Flash Microcontroller Family 16kb/32kb/64kb Isp/iap Flash With 512b/512b/1kb Ram - Nxp Semiconductors

The 89C51RB2 89C51RC2 89C51RD2 device contains a non-volatile 16kB/32kB/64kB Flash program memory that is both parallel programmable and serial In-System and In-Application Programmable. In-System Programming (ISP) allows the user to download new code while the Microcontroller sits in the application. In-Application Programming (IAP) means that the Microcontroller fetches new program code and reprograms itself while in the system. This allows for remote programming over a modem link. A default serial loader (boot loader) program in ROM allows serial In-System programming of the Flash memory via the UART without the need for a loader in the Flash code. For In-Application Programming, the user program erases and reprograms the Flash memory by use of standard routines contained in ROM. This device executes one machine cycle in 6 Clock cycles, hence providing twice the speed of a conventional 80C51. An OTP configuration bit lets the user select conventional 12 Clock Timing if desired. By NXP Semiconductors