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M38B71M1 Datasheet(PDF) 82 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 82 Page - Renesas Technology Corp

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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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