- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45035 > M37542M2-XXXSP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 PDF資料下載
參數(shù)資料
| 型號(hào)： | M37542M2-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 8.9 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件頁(yè)數(shù)： | 94/124頁(yè) |
| 文件大?。?/td> | 1238K |
| 代理商： | M37542M2-XXXSP |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)當(dāng)前第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)
7542 Group
Rev.3.03
Jul 11, 2008
Page 69 of 117
REJ03B0006-0303
NOTES ON USE
Countermeasures against noise
1. Shortest wiring length
(1) Package
Select the smallest possible package to make the total wiring
length short.
<Reason>
The wiring length depends on a microcomputer package. Use of a
small package, for example QFP and not DIP, makes the total wir-
ing length short to reduce influence of noise.
(3) Wiring for clock input/output pins
Make the length of wiring which is connected to clock I/O pins as
short as possible.
Make the length of wiring (within 20 mm) across the grounding
lead of a capacitor which is connected to an oscillator and the
VSS pin of a microcomputer as short as possible.
Separate the VSS pattern only for oscillation from other VSS pat-
terns.
<Reason>
If noise enters clock I/O pins, clock waveforms may be deformed.
This may cause a program failure or program runaway. Also, if a
potential difference is caused by the noise between the VSS level
of a microcomputer and the VSS level of an oscillator, the correct
clock will not be input in the microcomputer.
(2) Wiring for RESET pin
Make the length of wiring which is connected to the RESET pin as
short as possible. Especially, connect a capacitor across the
RESET pin and the VSS pin with the shortest possible wiring
(within 20mm).
<Reason>
The width of a pulse input into the RESET pin is determined by the
timing necessary conditions. If noise having a shorter pulse width
than the standard is input to the RESET pin, the reset is released
before the internal state of the microcomputer is completely initial-
ized. This may cause a program runaway.
Fig. 89 Wiring for clock I/O pins
Fig. 87 Selection of packages
DIP
SDIP
SOP
QFP
Fig. 88 Wiring for the RESET pin
RESET
Reset
circuit
Noise
VSS
Reset
circuit
VSS
RESET
VSS
N.G.
O.K.
Noise
XIN
XOUT
VSS
XIN
XOUT
VSS
N.G.
O.K.
(4) Wiring to CNVss pin
Connect the CNVss pin to the Vss pin with the shortest possible
wiring.
In the normal microcomputer mode, disconnect a wiring of a serial
rewrite circuit, which is for the flash memory version, from the
MCU by a jumper switch.
<Reason>
The processor mode of a microcomputer is influenced by a poten-
tial at the CNVss pin. If a potential difference is caused by the
noise between pins CNVss and Vss, the processor mode may be-
come unstable. This may cause a microcomputer malfunction or a
program runaway.
A wiring of a serial rewrite circuit may function as an antenna
which feeds noise into the microcomputer.
Fig. 90 Wiring for CNVss pin
Noise
CNVSS
VSS
N.G.
CNVSS
VSS
O.K.
CNVSS
VSS
Jumper switch
Serial
rewrite
circuit
O.K.
Flash memory version
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37542F8SP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37542F8FP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO36 |
| M37542F8GP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542F4GP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542F4FP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO36 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37542M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M4-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M4-XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M4-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542RSS | 功能描述:DEV EMULATION EVA CHIP FOR M3754 RoHS:否 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 配件 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關(guān)產(chǎn)品:1-Wire? 設(shè)備 產(chǎn)品目錄頁(yè)面:1429 (CN2011-ZH PDF) |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。