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| 型号： | 7549 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 58/73页 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 58 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
NOTES ON USE
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.
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.
Overvoltage
Take care not to apply the voltage above the Vcc pin voltage to
other pins. Make sure that the voltage of the CNV
SS
pin (V
PP
power input pin for QzROM) does not change as shown in the
bold-lined periods (Figure 79) when powering on and off. If the
voltage changes as shown, the QzROM contents may be
rewritten.
Fig 79. Timing Diagram (bold-lined periods are applicable)
NOTES ON QzROM
Notes On 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 (“MASK option” written in the
mask file converter) setup when making the mask file by using
the mask file converter MM.
Notes On ROM Code Protect
(QzROM product shipped after writing)
As for the QzROM product shipped after writing, the ROM code
protect is specified according to the ROM option setup data in
the mask file which is submitted at ordering.
Renesas Technology corp. write the value of the ROM option
setup data in the ROM code protect address (address FFDB
16
)
when writing to the QzROM. As a result, in the contents of the
ROM code protect address the ordered value may differ from the
actual written value.
The ROM option setup data in the mask file is “00
16
” for protect
enabled or “FF
16
” for protect disabled. Therefore, the contents of
the ROM code protect address (other than the user ROM area) of
the QzROM product shipped after writing is “00
16
” or “FF
16
”.
Note that the mask file which has nothing at the ROM option
data or has the data other than “00
16
” and “FF
16
” can not be
accepted.
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
specifi-cation 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.
V
CC
pin voltage
CNV
SS
pin voltage
1.8V
1.8V
(1) The input voltage to other MCU pins rises before the V
CC
pin
voltage rises.
(2) The input voltage to other MCU pins falls before the V
CC
pin
voltage falls.
Note: If V
CC
falls below the minimum value 1.8 V (shaded areas),
the internal circuit becomes unstable. Take additional care
to prevent overvoltage.
~
(1)
(2)
~
相关PDF资料 |
PDF描述 |
|---|---|
| 75HQ | SCHOTTKY RECTIFIER |
| 75HQ030 | SCHOTTKY RECTIFIER |
| 75HQ035 | SCHOTTKY RECTIFIER |
| 75HQ040 | SCHOTTKY RECTIFIER |
| 75HQ045 | SCHOTTKY RECTIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7-5-4905 | 功能描述:3M 4905 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4905 零件状态:在售 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
| 754905-1 | 功能描述:PIN ATT/ROLL AUTO IV 制造商:te connectivity amp connectors 系列:* 零件状态:有效 标准包装:1 |
| 7-5-4910 | 功能描述:3M 4910 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4910 零件状态:在售 底布，载体:丙烯酸泡棉 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
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