M37544G2AGP#U0 Renesas Electronics America, M37544G2AGP#U0 Datasheet - Page 37

• Manufacturer Part Number: M37544G2AGP#U0
• Description: IC 740 MCU OTP 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37544G2AGP#U0

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: WDT
• Number Of I /o: 25
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: QzROM
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Rev.1.04
REJ03B0012-0104Z
7544 Group
Clock Generating Circuit
An oscillation circuit can be formed by connecting a resonator be-
tween X
by connecting a resistor and a capacitor.
Use the circuit constants in accordance with the resonator
manufacturer's recommended values.
(1) On-chip oscillator operation
When the MCU operates by the on-chip oscillator for the main
clock, connect X
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
(2) Ceramic resonator and quartz-crystal oscillator
When the ceramic resonator and quartz-crystal oscillator is used
for the main clock, connect the ceramic/quartz-crystal oscillator
and the external circuit to pins X
tance. A feedback resistor is built in between pins X
(3) RC oscillation
When the RC oscillation is used for the main clock, connect the
X
capacitor C at the shortest distance.
The frequency is affected by a capacitor, a resistor and a micro-
computer.
So, set the constants within the range of the frequency limits.
(4) External clock
When the external signal clock is used for the main clock, connect
the X
IN
pin and X
IN
pin to the clock source and leave X
IN
and X
2004.06.08
OUT
IN
OUT
pin to the external circuit of resistor R and the
pin to V
, and an RC oscillation circuit can be formed
CC
page 35 of 66
and leave X
IN
and X
OUT
OUT
OUT
pin open.
at the shortest dis-
pin open.
IN
and X
OUT
.
Fig. 42 External circuit of RC oscillation
Fig. 41 External circuit of ceramic resonator and quartz-crystal
oscillator
Fig. 43 External clock input circuit
Fig. 40 Processing of X
tion
X
X
IN
IN
X
C
IN
IN
External oscillation
circuit
M37544
M37544
M37544
X
V
V
IN
CC
SS
IN
and X
X
X
Open
OUT
X
OUT
M37544
OUT
Rd
C
Note:
OUT
OUT
Note:
pins at on-chip oscillator opera-
The clock frequency of the
on-chip oscillator depends
on the supply voltage and
the operation temperature
range.
Be careful that variable fre-
quencies and obtain the
sufficient margin.
Note:
R
C
Externally connect a
damping resistor Rd
depending on the oscil-
lation frequency.
(A feedback resistor is
built-in.)
Use the resonator
mended value because
constants such as ca-
pacitance depend on
the resonator.
manufacturer’s recom-
Connect the external
circuit of resistor R
and the capacitor C at
the shortest distance.
The frequency is af-
fected by a capacitor,
a resistor and a micro-
computer.
So, set the constants
within the range of the
frequency limits.
Open
X
OUT