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UPD16664 Datasheet(PDF) 7 Page - NEC |
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UPD16664 Datasheet(HTML) 7 Page - NEC |
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7 / 52 page  Data Sheet S13780EJ1V0DS00 7 µµµµ PD16664 4. DATA BUS The byte data ordering on the data bus is little endian, in common with most NEC and Intel buses. 4.1 16-bit Data Bus (BMODE = L) Byte access D0 to D7 D8 to D15 Address incrementing direction 00000H 00002H 00004H : : 00001H 00003H 00005H : : Word access D0 to D7 D8 to D15 Address incrementing direction 00000H 00002H 00004H : : If the system accesses the µ PD16664 in word(16-bit) or byte(8-bit) units, /UBE (upper byte enable) and A0 specify whether bytes D0 to D7 or bytes D8 to D15 have valid data. /CS /OE /WE /UBE A0 MODE I/O D0 to D7 D8 to D15 H X X X X Not selected Hi-Z Hi-Z LL H L L H L H L Read Dout Hi-Z Dout Dout Dout Hi-Z LH L L L H L H L Write Din X Din Din Din X L L H X H X X H X H Output Disable Hi-Z Hi-Z Hi-Z Hi-Z Remark X : Don’t care Hi-Z : High impedance |
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