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M38B71M1 Datasheet(PDF) 82 Page - Renesas Technology Corp |
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M38B71M1 Datasheet(HTML) 82 Page - Renesas Technology Corp |
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82 / 110 page 
81 38B7 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS q Read command The microcomputer enters the read mode by inputting command code “0016” in the first cycle. The command code is latched into ___ the internal command latch at the rising edge of the WE input. When the address of a memory location to be read is input in the second cycle, with control signals input at the timing shown in Figure 87, the M38B79FF outputs the contents of the specified ad- dress from the data I/O pins to the external. The read mode is retained until any other command is latched into the command latch. Consequently, once the M38B79FF enters the read mode, the user can read out the successive memory contents simply by changing the input address and executing the second cycle only. Any command other than the read command must be in- put beginning from its command code over again each time the user execute it. The contents of the command latch immediately after power-on is 0016. Fig. 87 Timings during reading Address Valid address tWC tCH tCS tRC ta(CE) tDF tWRR tWP tRRW ta(OE) tDH tDH tVSC tCLZ tOLZ tDS ta(AD) VIH VIL VIH VIL VIH VIL VIH VIL VIH VIL VPPH VPPL CE OE WE Data VPP Dout 0016 |
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