參數(shù)資料
型號： M38D24G4HP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封裝： 10X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 34/136頁
文件大?。?/td> 2856K
代理商： M38D24G4HP
Rev.3.02
Apr 10, 2008
Page 129 of 131
REJ03B0177-0302
38D2 Group
Notes on QzROM Version
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.
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.
<Reason>
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
Ω
Termination of OSCSEL pin
OSCSEL
VCC
The shortest
about 5 k
Ω
(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)
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