7549 datasheet(83/86 Pages) RENESAS

83 / 86 page

Rev.2.02

Mar 31, 2009

Page 81 of 81

REJ03B0202-0202

7549 Group

Note on Memory

(1) Because the contents of RAM are indefinite at reset, set

initial values before using.

(2) Do not access to the reserved area.

(3) Random data is written into the Renesas shipment test area

and the reserved ROM area. Do not rewrite the data in these

areas. Data of these area may be changed without notice.

Accordingly, do not include these areas into programs such

as checksum of all ROM areas.

(4) The QzROM values in function set ROM data 0 to 2 set the

operating modes of the various peripheral functions after an

MCU reset is released. Do not fail to set the value for the

selected function. Bits designated with a fixed value of 1 or

0 must be set to the designated value.

Notes on QzROM

1. Note on 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 approx.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.

2. Overvoltage

Take care not to apply the voltage above the Vcc pin voltage to

other pins. Make sure that the voltage of the CNVSS pin (VPP

power input pin for QzROM) does not change as shown in the

bold-lined periods (Figure 91) when powering on and off. If the

voltage changes as shown, the QzROM contents may be

rewritten.

Fig 91. Timing Diagram (bold-lined periods are applicable)

3. QzROM Writing Orders

When ordering the QzROM product shipped after writing,

submit the mask file (extension: .mask) 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” 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

4. Data Required for QzROM Writing Orders

The following are necessary when ordering a QzROM product

shipped after writing:

1. QzROM Writing Confirmation Form*

2. Mark Specification Form*

3. 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.

VCC pin voltage

CNVSS pin voltage

1.8 V

(1) The input voltage to other MCU pins rises before the VCC pin

voltage rises.

(2) The input voltage to other MCU pins falls before the VCC pin

voltage falls.

Note: If VCC falls below the minimum value 1.8 V (shaded areas),

the internal circuit becomes unstable. Take additional care

to prevent overvoltage.

(1)

(2)

7549 Datasheet(PDF) 83 Page - Renesas Technology Corp

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