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M38B71M1 Datasheet(PDF) 84 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) 84 Page - Renesas Technology Corp

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83
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
q Erase command
The erase command is executed by inputting command code 2016
in the first cycle and command code 2016 again in the second
cycle. The command code is latched into the internal command
___
latch at the rising edges of the WE input in the first cycle and in
the second cycle, respectively. The erase operation is initiated at
___
the rising edge of the WE input in the second cycle, and the
memory contents are collectively erased within 9.5 ms as mea-
sured by the internal timer. Note that data 0016 must be written to
all memory locations before executing the erase command.
Note: An erase operation is not completed by executing the erase
command once. Always be sure to execute an erase verify
command after executing the erase command. When the fail-
ure is found in this verification, the user must repeatedly ex-
ecute the erase command until the pass. Refer to Figure 90
for the erase flowchart.
Fig. 89 Input/output timings during erasing (verify data is output at the same timing as for read.)
q Erase verify command
The user must verify the contents of all addresses after complet-
ing the erase command. The microcomputer enters the erase
verify mode by inputting the verify address and command code
A016 in the first cycle. The address is internally latched at the fall-
___
ing edge of the WE input, and the command code is internally
___
latched at the rising edge of the WE input. When control signals
are input in the second cycle at the timing shown in Figure 89, the
M38B79FF outputs the contents of the specified address to the
external.
Note: If any memory location where the contents have not been
erased is found in the erase verify operation, execute the op-
eration of “erase
→ erase verify” over again. In this case,
however, the user does not need to write data 0016 to memory
locations before erasing.
Address
Erase
Erase verify
Verify
address
tWC
tCS
tRRW
tWP
tWPH
tWP
tDE
tDS
2016
2016
A016
Dout
tDS
tDH
tDH
Verify data output
tDH
tVSC
tDS
tWP
tWRR
tCS
tCS
tCH
tCH
tCH
tAS
tAH
VIH
VIL
VIH
VIL
VIH
VIL
VIH
VIL
VIH
VIL
VPPH
VPPL
CE
OE
WE
Data
VPP


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