Accessing Registers without the 'reg' Prefix | Cypress Semiconductor
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Accessing Registers without the 'reg' Prefix
What happens when I write an assembly code to access a register without the "reg" keyword, for example, "mov A, [PRT1DR]". Does the assembler generate an error for this?
No. The assembler does not generate an error or warning if a register is accessed without the "reg" keyword. The register name defined in the m8c.inc file is only an address equate. So, if the assembler comes across an instruction with a register name, but without the "reg" keyword, it replaces the register name with the address of the register and the CPU will perform a RAM access instead of register access.