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D17133CS bảng dữ liệu(PDF) 92 Page - NEC |
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D17133CS bảng dữ liệu(HTML) 92 Page - NEC |
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92 / 289 page ![]() CHAPTER 9 REGISTER FILE (RF) 77 The assembler (AS17K) has the below flag symbol handling instructions defined internally as macros. SETn: Set a flag to 1 CLRn: Reset a flag to 0 SKTn: Skip when all flags are 1 SKFn: Skip when all flags are 0 NOTn: Invert a flag INITFLG: Initialize a flag (data setting per 4 bits) By using these incorporated macro instructions, the contents of the register file can be manipulated one bit at a time. Due to the fact that most of control register consists of 1-bit flags, the assembler (AS17K) has reserved words (predefined symbols) for use with these flags. However, note that there is no reserved word for the stack pointer for its use as a flag. The reserved word used for the stack pointer is "SP", for its use as data memory. For this reason, none of the above flag manipulation instructions using reserved words can be used for the stack pointer. |
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