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UPD78323LP Datasheet(PDF) 47 Page - NEC |
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UPD78323LP Datasheet(HTML) 47 Page - NEC |
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47 / 86 page  47 µPD78323, 78324 6. EXTERNAL DEVICE EXPANSION FUNCTION The µPD78324 can expand external devices (data memory, program memory peripheral device) for areas (8000H to FAFFH) except the internal ROM and RAM areas. Table 6-1 and 6-2 show the pin used for external device access and the pin function setting procedure. Table 6-1. Pin Function Setting ( µPD78324) Memory Expansion Mode Register MM0 to MM2 MM7 Fetch Cycle Control Register 00H 00H Except 00H EA Pin 1 Remarks 0 1 0 1 Port mode Expansion mode General port Setting prohibited AD0 to AD7 RD WR External device connection mode µPD71P301 connection mode Set to A8 to A15 in steps General port TAS TMD Pin Function P40 to P47 P50 to P57 P90 P91 P92 P93 P50 to P57 pins according to the externally expanded memory size. The memory can be expanded in steps from 256 bytes to about 32K bytes. The pins which are not used as the address bus can be used as the general-purpose input/output port. Table 6-2. Port and Address Setting for Port 5 ( µPD78324) P57 P56 P55 P54 P53 P52 P51 P50 External Address Space Port Port Port Port Port Port Port Port 256 bytes or less Port Port Port Port A11 A10 A9 A8 4K bytes or less Port Port A13 A12 A11 A10 A9 A8 16K bytes or less A15 A14 A13 A12 A11 A10 A9 A8 About 32K bytes or less Table 6-3. Pin Function Setting ( µPD78323) AD0 to AD7 A8 to A15 RD WR Memory Expansion Mode Register MM7 Fetch Cycle Control Register 00H Except 00H EA Pin ASTB 1 Remarks –– 0 1 External device connection mode µPD71P301 connection mode General port TAS TMD Pin Function AD0 to AD7 A8 to A15 RD WR P92 P93 µPD78324 emulation mode TAS TMD |
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