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C166 User's Guide
idata
The idata memory type may be used to declare variables only. You may not declare idata functions. This memory is accessed using 16-bit addresses and is on-chip RAM of the C16x/ST10/XC16x. It has the shortest (fastest) access time but the amount of idata is limited in size.
Variables declared idata are located in the SDATA group.
Declare idata variables as follows:
unsigned char idata fast_variable;
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