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MSM80C49 数据表(PDF) 13 Page - OKI electronic componets |
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MSM80C49 数据表(HTML) 13 Page - OKI electronic componets |
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13 / 20 page  13/20 ¡ Semiconductor MSM80C48/49/50, MSM80C35/39/40 Write (to external memory) Low-order 4 bits input/output of port 2 when expanded I/O port is used (in external program memory access mode) tCC tAW tDW FLOAT- ING DATA ADDRESS tWD ALE BUS WR ADDRESS PCH tPL tLP tDP tPD tPR tPF tCP tPC tPP PORT DATA PORT CONTROL OUTPUT DATA PCH PORT DATA PORT CONTROL INPUT DATA ALE PROG P20-3 (Output mode) P20-3 (Input mode) |
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