Renesas PCA4738L-64A Información técnica descargar pdf (Pagina 72)

3886 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

● 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 M38869FFAHP/GP internally

___

latches the address at the falling edge of the WE input and the

___

data at the rising edge of the WE input. The M38869FFAHP/GP

___

starts programming at the rising edge of the WE input in the sec-

ond cycle and finishes programming 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 71 for the programming flowchart.

● 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 69, the

M38869FFAHP/GP outputs the programmed address’s contents to

the external. Since the address is internally latched when the pro-

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

second cycle.

Fig. 69 Input/output timings during programming (Verify data is output at the same timing as for read.)

Address

Program

Program verify

Program

address

RRW

WPH

Dout

Verify data output

VSC

WRR

Data

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 112 113

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