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UPD784927GF Datasheet(PDF) 21 Page - NEC |
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UPD784927GF Datasheet(HTML) 21 Page - NEC |
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21 / 96 page  21 µPD784927, 784928, 784927Y, 784928Y Data Sheet U12255EJ2V0DS00 3.2 Memory Space A memory space of 1M bytes can be accessed. The mapping of the internal data area (special function registers and internal RAM) can be selected by using the LOCATION instruction. The LOCATION instruction must be always executed after reset has been cleared, and cannot be used more than once. (1) When LOCATION 0H instruction is executed Part Number Internal Data Area Internal ROM Area µPD784927, 784927Y 0F700H-0FFFFH 00000H-0F6FFH 10000H-17FFFH µPD784928, 784928Y 0F100H-0FFFFH 00000H-0F0FFH 10000H-1FFFFH Remark The area of the internal ROM overlapping the internal data area cannot be used when the LOCATION 0 instruction is executed. Part Number Unusable Area µPD784927, 784927Y 0F700H-0FFFFH (2304 bytes) µPD784928, 784928Y 0F100H-0FFFFH (3840 bytes) (2) When LOCATION 0FH instruction is executed Part Number Internal Data Area Internal ROM Area µPD784927, 784927Y FF700H-FFFFFH 00000H-17FFFH µPD784928, 784928Y FF100H-FFFFFH 00000H-1FFFFH |
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