AH500 Programming Manual
4-6
4.3 Index Registers
The index register is the 16-bit data register. It is like the general register in that the data can be
read from it and written into it.
However, it is mainly used as the index register. The range of index
registers is E0~E13.
The index register is used as follows.
1. Using the register name to modify the device
When M0 is ON, E0=10, D0@E0=D (0+10)=D10, and D1=D10.
When M0 is ON, E0=10, E1=17, D1@E0=D (1+10)=D11, and the bit part 1@E1=(1+17)=18.
However, the maximum bit number is 15. Since m=18/16=1 and n=18%16=2 (getting the
remainder), the last modification result is D (11+m).n=D12.2. D12.2 is ON.
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