M38D59GCHP#U0 Renesas Electronics America, M38D59GCHP#U0 Datasheet - Page 99

• Manufacturer Part Number: M38D59GCHP#U0
• Description: IC 740/38D5 MCU QZ-ROM 80LQFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M38D59GCHP#U0

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 12.5MHz
• Connectivity: SIO, UART/USART
• Peripherals: LCD, LED, PWM, WDT
• Number Of I /o: 59
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: QzROM
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

38D5 Group
Rev.3.04
REJ03B0158-0304
(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
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.
1. Keeping oscillator away from large current signal lines
• 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.
2. Installing oscillator away from signal lines where potential
• 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.
Fig. 94 Wiring for a large current signal line/Wiring of
Install a microcomputer (and especially an oscillator) as far as
possible from signal lines where a current larger than the
tolerance of current value flows.
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.
1. Keeping oscillator away from large current signal lines
2. Installing oscillator away from signal lines where potential
levels change frequently
signal lines where potential levels change
frequently
Mutual inductance
May 20, 2008 Page 97 of 134
Do not cross.
current
Large
N.G.
M
GND
CNTR
X
X
V
Microcomputer
X
X
V
IN
OUT
SS
IN
OUT
SS
(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 size
When 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
evaluation for each product of every after confirming product
specification.