參數(shù)資料
型號(hào)： M38C59MF-XXXHP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PQFP80
封裝： 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁(yè)數(shù)： 57/75頁(yè)
文件大?。?/td> 995K
代理商： M38C59MF-XXXHP
Rev.2.00
Nov 23, 2005
page 60 of 73
REJ03B0028-0200
38C5 Group
(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
osillator and oscillation circuit constants. Be careful especially when
range of voltage 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 pos-
sible from signal lines where a current larger than the tolerance 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 occurs
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 wave-
forms 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
(4) Analog input
The analog input pin is connected to the capacitor of a voltage com-
parator. Accordingly, sufficient accuracy may not be obtained by the
charge/discharge current at the time of A/D conversion when the ana-
log signal source of high-impedance is connected to an analog input
pin. In order to obtain the A/D covnversion 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 con-
version accuracy, and the amount of -proof of noise incorrect opera-
tion 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 at 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.
Fig. 62 Wiring for the VPP pin of One Time PROM
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 the mask ROM and
One Time PROM version MCUs due to the difference in the manu-
facturing 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.
Fig. 61 Wiring for a large current signal line/Writing of signal
lines where potential levels change frequently
XIN
XOUT
VSS
Microcomputer
Mutual inductance
Large
current
GND
XIN
XOUT
VSS
CNTR
Do not cross
N.
G.
M
CNVSS/(VPP)
VSS
The shortest
Approx. 5k
(Note)
Note. Shows the microcomputer's pin.
相關(guān)PDF資料
PDF描述
M38K27M4-XXXHP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
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M41T00SM6F 0 TIMER(S), REAL TIME CLOCK, PDSO8
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