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UPD70F3201 Datasheet(PDF) 29 Page - NEC |
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UPD70F3201 Datasheet(HTML) 29 Page - NEC |
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29 / 98 page  Preliminary Product Information U15436EJ1V0PM 29 µµµµPD703201, 703201Y, 703204, 703204Y, 70F3201, 70F3201Y, 70F3204, 70F3204Y The number of basic clocks required for accessing each area in the address space is as follows. Table 5-3. Number of Access Clocks Area (Bus Width) Bus Cycle Type Internal ROM (32 Bits) Internal RAM (32 Bits) External Memory (16 Bits) Instruction fetch (normal access) 1 1 or 2 3 + n Note Instruction fetch (branch) 2 1 or 2 3 + n Note Operand data access 3 1 3 + n Note Note 2 + n clocks when the separate bus is selected. n is the number of waits. Figure 5-1. Example of Timing In Separate Bus Mode (Read → → → → Write) T1 T2 Address Address Data Data WAIT (input) AD0 to AD15 (I/O) WR0, WR1 (output) RD (output) A0 to A23 (output) CLKOUT (output) T2 T1 Remark The broken lines indicates the high-impedance state |
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