Technical reference

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CPU registers


The MC68HC11 has two 8-bit accumulators (A and B), one 16-bit accumulator (D) formed by A and B; where A is the MSB and B is the LSB. The microcontroller also has two 16-bit index registers, namely X and Y. A 16-bit stackpointer (SP) and a 16 bit programcounter (PC). The condition-code-register, or flag-register, has 8 flags:

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