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UPD17P136ACT Datasheet(PDF) 114 Page - NEC |
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UPD17P136ACT Datasheet(HTML) 114 Page - NEC |
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114 / 292 page  CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU) 95 11.5.2 FALSE (0) Bit Judgement The FALSE (0) bit judgement instruction (SKF m, #n) is used to determine whether or not the bits specified by n in the 4 bits of data memory m are FALSE (0). When all bits specified by n are FALSE (0), this instruction causes the next instruction to be skipped. Example MOV M1, #1001B ; SKF M1, #0110B ; (1) BR A ; BR B ; SKF M1, #1110B ; (2) BR C ; BR D ; In this example, bits 2 and 1 of data memory M1 are judged in step number (1). Because both bits are FALSE (0), the program branches to B. In step number (2), bits 3, 2, and 1 of data memory M1 are judged. Since bit 3 of data memory M1 is TRUE (1), the program branches to C. |
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