M38047FBHKP datasheet(99/116 Pages) RENESAS

99 / 116 page

Rev.1.01

Jan 25, 2005

page 99 of 114

REJ03B0131-0101Z

3804 Group (Spec. H)

NOTES ON USAGE

Handling of Power Source Pins

In order to avoid a latch-up occurrence, connect a capacitor suit-

able for high frequencies as bypass capacitor between power

source pin (VCC pin) and GND pin (VSS pin), and between power

source pin (VCC pin) and analog power source input pin (AVSS

pin). Besides, connect the capacitor to as close as possible. For

bypass capacitor which should not be located too far from the pins

to be connected, a ceramic capacitor of 0.01

µF–0.1 µF is recom-

mended.

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 power source voltage is less than

the recommended operating conditions and design a system not

to cause errors to the system by this unstable operation.

Flash Memory Version

The CNVss pin determines the flash memory mode. To improve

the noise reduction, connect a track between CNVss pin and Vss

pin or Vcc pin with 1 to 10 k

Ω resistance. The mask ROM version

track of CNVss pin has no operational interference even if it is

connected to Vss pin or Vcc pin via a resistor.

Electric Characteristic Differences Between

Mask ROM and Flash Memory Version MCUs

There are differences in electric characteristics, operation margin,

noise immunity, and noise radiation between Mask ROM and

Flash Memory version MCUs due to the difference in the manufac-

turing processes, built-in ROM, and layout pattern etc.When

manufacturing an application system with the Flash Memory ver-

sion and then switching to use of the Mask ROM version, please

conduct evaluations equivalent to the system evaluations con-

ducted for the flash memory version.

DATA REQUIRED FOR MASK ORDERS

The following are necessary when ordering a mask ROM produc-

tion:

1.Mask ROM Confirmation Form ✽

2.Mark Specification Form ✽

3.Data to be written to ROM, in EPROM form (three identical cop-

ies)

✽ For the mask ROM confirmation and the mark specifications,

refer to the “Renesas Technology Corp.” Homepage

(http://www.renesas.com/en/rom).

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