M38B77FD datasheet(83/110 Pages) RENESAS

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38B7 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

q Program command

The microcomputer enters the program mode by inputting com-

mand code “4016” 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 which indicates a program location and data is

input in the second cycle, the M38B79FF internally latches the ad-

___

dress at the falling edge of the WE input and the data at the rising

___

edge of the WE input. The M38B79FF starts programming at the

___

rising edge of the WE input in the second cycle and finishes pro-

gramming within 10

µs as measured by its internal timer.

Programming is performed in units of bytes.

Note: A programming operation is not completed by executing the

program command once. Always be sure to execute a pro-

gram verify command after executing the program command.

When the failure is found in this verification, the user must re-

peatedly execute the program command until the pass. Refer

to Figure 90 for the programming flowchart.

q Program verify command

The microcomputer enters the program verify mode by inputting

command code “C016” in the first cycle. This command is used to

verify the programmed data after executing the program com-

mand. The command code is latched into the internal command

___

latch at the rising edge of the WE input. When control signals are

input in the second cycle at the timing shown in Figure 88, the

M38B79FF outputs the programmed address’s contents to the ex-

ternal. Since the address is internally latched when the program

command is executed, there is no need to input it in the second

cycle.

Fig. 88 Input/output timings during programming (Verify data is output at the same timing as for read.)

Address

Program

Program verify

Program

address

tWC

tCS

tRRW

tWP

tWPH

tWP

tDP

tDS

4016

DIN

C016

Dout

tDS

tDH

Verify data output

tDH

tVSC

tDS

tWP

tWRR

tCS

tCH

tAS

tAH

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VPPH

VPPL

Data

VPP

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