The boot loader communicates to the user via a serial link using the on board As a result, after the reset, the processor will start to execute the boot loader instead of the user program (Flash This ROM code is the so called boots loader.īy applying specific voltage conditions to some of the processors (I/O) pins duringĪ reset pulse, this piece of ROM code is activated. The new program is loaded via a serial modem link using the controller'sĪpart from the normal Flash memory, the processor also contains a piece of ROM code To download new code into the flash memory while the microcontroller sits in theĪpplication. On this page I will discuss the In-System Programming option. The processor itself can (re)program a memory block other than that it is executing.The flash memory can be programmed in three different ways: The lower two blocksĪre both 8kB in size. The P89C51RB2/RC2/RD2 device contains a non-volatileġ6kB/32kB/64kB memory. The P89C51RB2/RC2/RD2 family of microcontrollers are fully 80C51 compatible with In Circuit Programming for the P89C51 In Circuit Programming for the P89C51 Ronald Dekker
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