On-chip 1792 bytes Expanded RAM XRAM Software Selectable Size 0, 256, 512, 768, 1024, 1792 Bytes 768 Bytes Selected at Reset for T89C51RD2 Compatibility.
64K Bytes On-chip Flash Program/Data Memory Byte and Bytes Erase and Write 100k Write Cycles. In X2 mode 6 Clocks/machine cycle 20 MHz Vcc 2.7V to 5.5V, both Internal and external code execution 30 MHz Vcc 4.5V to 5.5V and Internal Code execution only In Standard Mode 40 MHz Vcc 2.7V to 5.5V, both Internal and external code execution 60 MHz Vcc 4.5V to 5.5V and Internal Code execution only 2048 Bytes Boot ROM Contains Low Level Flash Programming Routines and a Default. ISP In-System Programming Using Standard VCC Power Supply. Integrated Power Monitor POR/PFD to Supervise Internal Power Supply. 80C52 Compatible 8051 Instruction Compatible Six 8-bit I/O Ports 64 Pins or 68 Pins Versions Four 8-bit I/O Ports 44 Pins Version Three 16-bit Timer/Counters 256 Bytes Scratch Pad RAM 9 Interrupt Sources with 4 Priority Levels. Information about shipping policies for other countries can be found here: Payment and Delivery Information 2 In accordance with. 
Note that extensive help is available from within FLIP. AT89C51RC2 FLIP Programming Guide In order to program the. AT89C51IC2, AT89C51RD2, AT89C51ED2 bootloader datasheets. SBV: Software Boot Vector: Bootloader starting address (an XAF configuration byte).
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