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| 型号： | M38227MCA-XXXHP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 5 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件页数： | 40/59页 |
| 文件大小： | 900K |
| 代理商： | M38227MCA-XXXHP |
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Rev.1.20
Dec 24, 2003
page 45 of 57
3822 Group (A ver.)
(3) Oscillator concerns
In order to obtain the stabilized operation clock on the user system
and its condition, contact the oscillator manufacturer and select
the oscillator and oscillation circuit constants. Be careful espe-
cially when range of votage and temperature is wide.
Also, take care to prevent an oscillator that generates clocks for a
microcomputer operation from being affected by other signals.
Keeping oscillator away from large current signal lines
Install a microcomputer (and especially an oscillator) as far as
possible from signal lines where a current larger than the toler-
ance of current value flows.
q Reason
In the system using a microcomputer, there are signal lines for
controlling motors, LEDs, and thermal heads or others. When a
large current flows through those signal lines, strong noise oc-
curs because of mutual inductance.
Installing oscillator away from signal lines where potential levels
change frequently
Install an oscillator and a connecting pattern of an oscillator
away from signal lines where potential levels change frequently.
Also, do not cross such signal lines over the clock lines or the
signal lines which are sensitive to noise.
q Reason
Signal lines where potential levels change frequently (such as
the CNTR pin signal line) may affect other lines at signal rising
edge or falling edge. If such lines cross over a clock line, clock
waveforms may be deformed, which causes a microcomputer
failure or a program runaway.
Keeping oscillator away from large current signal lines
Installing oscillator away from signal lines where potential
levels change frequently
Fig. 47 Wiring for the VPP pin of One Time PROM
Fig. 46 Wiring for a large current signal line/Wiring of signal
lines where potential levels change frequently
P40/VPP
VSS
About 5k
(4) Analog input
The analog input pin is connected to the capacitor of a voltage
comparator. Accordingly, sufficient accuracy may not be obtained
by the charge/discharge current at the time of A-D conversion
when the analog signal source of high-impedance is connected to
an analog input pin. In order to obtain the A-D conversion result
stabilized more, please lower the impedance of an analog signal
source, or add the smoothing capacitor to an analog input pin.
(5) Difference of memory type and size
When Mask ROM and PROM version and memory size differ in
one group, actual values such as an electrical characteristics, A-D
conversion accuracy, and the amount of -proof of noise incorrect
operation may differ from the ideal values.
When these products are used switching, perform system evalua-
tion for each product of every after confirming product
specification.
(6) Wiring to VPP pin of One Time PROM version
Connect an approximately 5 k
resistor to the VPP pin the
shortest possible in series and also to the VSS pin.
Note: Even when a circuit which included an approximately 5 k
resistor is used in the Mask ROM version, the microcomputer
operates correctly.
q Reason
The VPP pin of the One Time PROM version is the power source
input pin for the built-in PROM. When programming in the built-in
PROM, the impedance of the VPP pin is low to allow the electric
current for writing flow into the built-in PROM. Because of this,
noise can enter easily. If noise enters the VPP pin, abnormal in-
struction codes or data are read from the built-in PROM, which
may cause a program runaway.
Electric Characteristic Differences Between
Mask ROM and One Time PROM Version MCUs
There are differences in electric characteristics, operation margin,
noise immunity, and noise radiation between Mask ROM and
One Time PROM version MCUs due to the difference in the manufac-
turing processes.
When manufacturing an application system with the One TIme PROM
version and then switching to use of the Mask ROM version,
please perform sufficient evaluations for the commercial
samples of the Mask ROM version.
XIN
XOUT
VSS
Microcomputer
Mutual inductance
Large
current
GND
M
XIN
XOUT
VSS
CNTR
Do not cross
N.G.
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| M38234G4FP#U0 | 功能描述:MCU 2/5V 16K 80-QFP QZ-ROM RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI，I²C，UART/USART 外围设备:POR，PWM，WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC（J 形引线） 包装:带卷 (TR) |
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