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The C51 manual states, "The using attribute may not be used in functions that return a value in registers" and goes on to state, "Even when you use the same register bank, functions declared with the using attribute cannot return a bit value." It's clear that a bit value set in the carry flag isn't passed back to the calling function. It's not clear why a function "using" a register bank can't call another function "using" the same register bank: The same bank select bits are being pushed, loaded, and popped. Am I missing something, or is this an OK thing to do?