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UPD178024GC Datasheet(PDF) 18 Page - NEC |
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UPD178024GC Datasheet(HTML) 18 Page - NEC |
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18 / 56 page  18 µPD178023, 178024 Data Sheet U14126EJ1V0DS00 2.2 Internal Extension RAM Size Select Register (IXS) The internal extension RAM size select register (IXS) sets the internal extension RAM capacity. Use the µPD178023, µPD178024 with the initial value (0CH). Use an 8-bit memory manipulation instruction to set the IXS. This register is set to 0CH at reset. Caution Do not assign a value other than that the value at reset. Figure 2-3. Format of Internal Extension RAM Size Select Register (IXS) IXRAM4 IXRAM3 IXRAM2 IXRAM1 IXRAM0 Selects Internal Extension RAM Capacity 01100 0 byte Others Setting prohibited Table 2-2 indicates the setting of IXS. Table 2-2. Set Value of Internal Extension RAM Size Select Register Targeted Model Set Value of IXS µPD178023, 178024 0CH 7 0 6 0 5 0 4 IXRAM4 3 IXRAM3 2 IXRAM2 1 IXRAM1 0 IXRAM0 Symbol IXS At reset 0CH R/W R/W Address FFF4H |
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