4518 datasheet(156/160 Pages) RENESAS

156 / 160 page

Rev.3.01

2005.06.15

page 156 of 157

REJ03B0008-0301

4518 Group

(1) PROM mode

The built-in PROM version has a PROM mode in addition to a nor-

mal operation mode. The PROM mode is used to write to and read

from the built-in PROM.

In the PROM mode, the programming adapter can be used with a

general-purpose PROM programmer to write to or read from the

built-in PROM as if it were M5M27C256K.

Programming adapter is listed in Table 24. Contact addresses at

the end of this data sheet for the appropriate PROM programmer.

• Writing and reading of built-in PROM

Programming voltage is 12.5 V. Write the program in the PROM of

the built-in PROM version as shown in Figure 76.

(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

Technology 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 77 before using is rec-

ommended (Products shipped in blank: PROM contents is not

written in factory when shipped).

(3) Electric Characteristic Differences

Between Mask ROM and One TIme PROM

Version MCU

There are differences in electric characteristics, operation margin,

noise immunity, and noise radiation between Mask ROM and One

Time PROM version MCUs due to the difference in the manufactur-

ing processes.

When manufacturing an application system with the One Time

PROM version and then switching to use of the Mask ROM ver-

sion, please perform sufficient evaluations for the commercial

samples of the Mask ROM version.

Fig. 76 PROM memory map

Fig. 77 Flow of writing and test of the product shipped in blank

Microcomputer

M34518E8FP

M34518E8SP

Name of Programming Adapter

PCA7442FP

PCA7442SP

Table 24 Programming adapter

Address

000016

3FFF16

7FFF16

High-order 5 bits

Low-order 5 bits

400016

1FFF16

5FFF16

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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