M34250M2 查看數據表（PDF） - Renesas Electronics

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M34250M2

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Renesas Electronics 

MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

(1) PROM mode

The 4250 Group has a function to serially input/output the

command codes, addresses, and data required for operation

(e.g. read and program) on the built-in PROM using only a

few pins. This mode can be selected by setting pins SDA (serial

data input/output), SCLK (serial clock input), and PGM to “H”

after connecting wires as shown in Figure 32 and powering

on the VDD pin, and then applying 12 V to the VPP pin.

In the PROM mode, three types of software commands (read,

program, and program verify) can be used.

Clock-synchronous serial I/O is used, beginning from the LSB

(LSB first). Use the special-purpose serial programmer when

performing serial read/program.

Refer to the Mitsubishi Data Book “DEVELOPMENT

SUPPORT TOOLS FOR MICROCOMPUTERS” about the

serial programmer (serial programmer and control software,

etc.) for the Mitsubishi single-chip microcomputers.

(2) Notes on handling

ΠA high-voltage is used for writing. Take care that overvoltage

is not applied. Take care especially at turning on the power.

 For the One Time PROM version shipped in blank,

Mitsubishi Electric corp. does not perform PROM writing

test and screening in the assembly process and following

processes. In order to improve reliability after writing,

performing writing and test according to the flow shown in

Figure 33 before using is recommended (Products shipped

in blank: PROM contents is not written in factory when

shipped)

Writing with PROM programmer

Screening (Leave at 150 °C for 40 hours) (Note)

Verify test with PROM programmer

Function test in target device

Note: Since the screening temperature is higher

than storage temperature, never expose the

microcomputer to 150°C exceeding 100

hours.

Fig. 33 Flow of writing and test of the product shipped in

blank

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