4501 datasheet(110/116 Pages) RENESAS

110 / 116 page

Rev.3.01

2005.02.07

page 110 of 112

REJ03B0104-0301

4501 Group

Table 20 Product of built-in PROM version

PROM size

(✕ 10 bits)

4096 words

RAM size

(✕ 4 bits)

256 words

M34501E4FP

One Time PROM [shipped in blank]

PRSP0020DA-A

BUILT-IN PROM VERSION

In addition to the mask ROM versions, the 4501 Group has the

One Time PROM versions whose PROMs can only be written to

and not be erased.

The built-in PROM version has functions similar to those of the

mask ROM versions, but it has PROM mode that enables writing to

built-in PROM.

Table 20 shows the product of built-in PROM version. Figure 56

shows the pin configurations of built-in PROM versions.

The One Time PROM version has pin-compatibility with the mask

ROM version.

(1) PROM mode

The 4501 Group has a PROM mode in addition to a normal opera-

tion mode. It 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), PGM to “H” after connecting wires as

shown in Figure 56 and powering on the VDD pin, and then apply-

ing 12 V to the VPP pin.

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

gram, and program verify) can be used. Clock-synchronous serial

I/O is used, beginning from the LSB (LSB first).

Use the special-perpose serial programmer when performing serial

read/program.

As for the serial programmer for the single-chip microcomputer (se-

rial programmer and control software), refer to the “Renesas

Microcomputer Development Support Tools” Hompage (http://

www.renesas.com/en/tools).

Fig. 55 Flow of writing and test of the product shipped in blank

ROM type

Package

Part number

(2) Notes on handling

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

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

➁ For the One Time PROM version shipped in blank, Renesas

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 55 before using is recommended (Prod-

ucts 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

Since the screening temperature is higher

than storage temperature, never expose the

microcomputer to 150

°C exceeding 100

hours.

Note:

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