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UPD17P133CS Datasheet(PDF) 81 Page - NEC |
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UPD17P133CS Datasheet(HTML) 81 Page - NEC |
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81 / 289 page  CHAPTER 7 SYSTEM REGISTER (SYSREG) 66 By using these macro instructions, data memory can be handled as flags as shown below in Example 3. The functions of the program status word and the memory pointer enable flag are defined in bit units (flag units) and each bit has a reserved word MPE, BCD, CMP, CY, Z and IXE defined for it. If these flag reserved words are used, the incorporated macro instructions can be used as shown in Example 4. Example 3. F0003 FLG 0.00.3 ; Flag symbol definition SET1 F0003 ; Incorporated macro Expanded macro OR .MF.F0003 SHR 4, #.DF.F0003 AND 0FH ; Set bit 3 of address 00H of BANK0 Example 4. SET1 BCD ; Incorporated macro Expanded macro OR .MF.BCD SHR 4, #.DF.BCD AND 0FH ; Set the BCD flag ; BCD is defined as "BCD FLG 0.7EH.0" CLR2 Z, CY ; Identical address flag Expanded macro AND .MF.Z SHR 4, #.DF. (NOT (Z OR CY) AND 0FH) CLR2 Z, BCD ; Different address flag Expanded macro AND .MF.Z SHR 4, #.DF. (NOT Z AND 0FH) AND .MF.BCD SHR 4, #.DF. (NOT BCD AND 0FH) |
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