7540 datasheet(313/366 Pages) RENESAS

313 / 366 page

3-91

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPENDIX

3.3 Notes on use

3.3.18 Notes on built-in PROM version

(1) Programming adapter

Use a special programming adapter shown in Table 3.3.1 and a general-purpose PROM programmer

when reading from or programming to the built-in PROM in the built-in PROM version.

Table 3.3.1 Programming adapters

M37540E8GP (One Time PROM version shipped in blank)

M37540E8SP (One Time PROM version shipped in blank)

M37540E8FP (One Time PROM version shipped in blank)

PCA7435GPG03

PCA7435SPG02

PCA7435FPG02

Programming adapter

Part Number

(2) Programming/reading

In PROM mode, operation is the same as that of the M5M27C101AK, but programming conditions

of PROM programmer are not set automatically because there are no internal device ID codes.

Accurately set the following conditions for data programming /reading. Take care not to apply 21 V

to VPP pin (is also used as the CNVSS pin), or the product may be permanently damaged.

• Programming voltage: 12.5 V

• Setting of PROM programmer switch: refer to Table 3.3.2.

Part Number

PROM programmer

start address

PROM programmer

end address

M37540E8GP

M37540E8SP

M37540E8FP

Table 3.3.2 PROM programmer address setting

Note: Addersses 808016 to FFFD16 in the built-in PROM corresponds to addresses 0808016 to 0FFFD16 in

the PROM programmer.

Address 0808016 (Note)

Address 0FFFD16 (Note)

3.3.19 Note on Power Source Voltage

When the power source voltage value of a microcomputer is less than the value which is indicated as the

recommended operating conditions, the microcomputer does not operate normally and may perform unstable

operation.

In a system where the power source voltage drops slowly when the power source voltage drops or the

power supply is turned off, reset a microcomputer when the supply voltage is less than the recommended

operating conditions and design a system not to cause errors to the system by this unstable operation.

3.3.20 Electric Characteristic Differences Among Mask ROM and One TIme PROM Version MCUs

There are differences in electric characteristics, operation margin, noise immunity, and noise radiation

among mask ROM and One Time PROM version MCUs due to the differences in the manufacturing

processes.

When manufacturing an application system with One Time PROM version and then switching to use of the

mask ROM version, perform sufficient evaluations for the commercial samples of the mask ROM version.

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