38D2 datasheet(129/136 Pages) RENESAS

129 / 136 page

Rev.3.02

Apr 10, 2008

Page 129 of 131

REJ03B0177-0302

38D2 Group

Notes on QzROM Version

Wiring to OSCSEL pin

(1) OSCSEL = L

Connect the OSCSEL pin the shortest possible to the GND

pattern which is supplied to the VSS pin of the microcomputer. In

addition connecting an approximately 5 k

Ω resistor in series to

the GND could improve noise immunity. In this case as well as

the above mention, connect the pin the shortest possible to the

GND pattern which is supplied to the VSS pin of the

microcomputer.

(2) OSCSEL = H

Connect the OSCSEL pin the shortest possible to the VCC pattern

which is supplied to the VCC pin of the microcomputer. In

addition connecting an approximately 5 k

Ω resistor in series to

the VCC could improve noise immunity. In this case as well as

the above mention, connect the pin the shortest possible to the

VCC pattern which is supplied to the VCC pin of the

microcomputer.

The OSCSEL pin is the power source input pin for the built-in

QzROM.

When programming in the QzROM, the impedance of the

OSCSEL pin is low to allow the electric current for writing to

flow into the built-in QzROM. Because of this, noise can enter

easily. If noise enters the OSCSEL pin, abnormal instruction

codes or data are read from the QzROM, which may cause a

program runaway.

Fig. 106 Wiring for OSCSEL pin

Overvoltage in QzROM Version

Make sure that voltage exceeding the VCC pin voltage is not

applied to other pins. In particular, ensure that the state indicated

by bold lines in figure below does not occur for pin OSCSEL pin

(VPP power source pin for QzROM) during power-on or power-

off. Otherwise the contents of QzROM could be rewritten.

Fig. 107 Timing Diagram (Bold-lined periods are applicable)

QzROM Version Product Shipped in Blank

As for the product shipped in blank, Renesas does not perform

the writing test to user ROM area after the assembly process

though the QzROM writing test is performed enough before the

assembly process. Therefore, a writing error of approximate

0.1% may occur.

Moreover, please note the contact of cables and foreign bodies on

a socket, etc. because a writing environment may cause some

writing errors.

Ordering QzROM Writing

1. Notes On QzROM Writing Orders

When ordering the QzROM product shipped after writing,

submit the mask file (extension: .msk) which is made by the

mask file converter MM.

• Be sure to set the ROM option data* setup when making the

mask file by using the mask file converter MM.. The ROM

code protect is specified according to the ROM option data* in

the mask file which is submitted at ordering. Note that the

mask file which has nothing at the ROM option data* or has

the data other than “0016”, “FE16” and “FF16” can not be

accepted.

•Set “FF16” to the ROM code protect address in ROM data

regardless of the presence or absence of a protect. When data

other than “FF16” is set, we may ask that the ROM data be

submitted again.

* ROM option data: mask option noted in MM

2. Data Required for QzROM Ordering

The following are necessary when ordering a QzROM product

shipped after writing:

• QzROM Writing Confirmation Form*

• Mark Specification Form*

• ROM data: Mask file

* For the QzROM writing confirmation form and the mark

specification form, refer to the “Renesas Technology Corp.”

Homepage (http://www.renesas.com/homepage.jsp).

Note that we cannot deal with special font marking (customer's

trademark etc.) in QzROM microcomputer.

3. QzROM Product Receiving Procedure

When writing to QzROM is performed by user side, the

receiving inspection by the following flow is necessary.

OSCSEL

VSS

The shortest

about 5 k

Termination of OSCSEL pin

OSCSEL

VCC

The shortest

about 5 k

(1) OSCSEL = L

(2) OSCSEL = H

(1)

Note 1: It shows the microcomputer’s pin

VCC pin voltage

OSCSEL pin voltage

“H” input

OSCSEL pin voltage

“L” input

1.8V

(1) Input voltage to other MCU pins rises before VCC pin voltage.

(2) Input voltage to other MCU pins falls after VCC pin voltage.

Note: The internal circuitry is unstable when VCC is below the minimum voltage

specification of 1.8 V (shaded portion), so particular care should be

exercised regarding overvoltage.

(1)

(2)

38D2 Datasheet(PDF) 129 Page - Renesas Technology Corp

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