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UPD70208H Datasheet(PDF) 21 Page - NEC |
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UPD70208H Datasheet(HTML) 21 Page - NEC |
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21 / 110 page  21 µPD70208H, 70216H Data Sheet U13225EJ4V0DS00 2.2 I/O SPACE In the V40HL and V50HL, I/Os up to 64K bytes (32K words) can be accessed in an area independent of the memory. The various on-chip peripheral LSIs are set by accessing the system I/O area. Extended functions added to those of the V40 and V50 are mapped onto unused V40 and V50 registers and the reserved area. The I/O map is shown in Figure 2-3. Figure 2-3. I/O Map DMAU FFFFH FFE0H FFDFH FF00H FEFFH 0000H 256 Bytes ICU TCU SCU Reserved Area System I/O Area Area used for setting of I/O boundary, WCU, REFU, baud rate generator, etc., and DMAU, ICU, TCU and SCU allocation. The DMAU, ICU, TCU and SCU are allocated within any 256 bytes. Internal I/O Area External I/O Area |
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