M37542F8FP#U0 Renesas Electronics America, M37542F8FP#U0 Datasheet - Page 63

• Manufacturer Part Number: M37542F8FP#U0
• Description: IC 740 MCU FLASH 32K 36SSOP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37542F8FP#U0

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: WDT
• Number Of I /o: 29
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

7542 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.
No external resistor is needed between X
feed-back resistor exists on-chip. (An external feed-back resistor
may be needed depending on conditions.)
(1) On-chip oscillator operation
When the MCU operates by the on-chip oscillator for the main
clock, connect X
pin open.
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
When the ceramic resonator is used for the main clock, connect
the ceramic resonator and the external circuit to pins X
X
tween 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
Select “0” (ceramic oscillation) to oscillation mode selection bit of
CPU mode register (003B
Rev.3.03
REJ03B0006-0303
OUT
IN
pin and X
IN
at the shortest distance. A feedback resistor is built in be-
pin to the clock source and leave X
IN
and X
IN
OUT
Jul 11, 2008
and X
OUT
IN
pin to the external circuit of resistor R and the
pin to V
, and an RC oscillation circuit can be formed
OUT
.
16
CC
).
through a resistor and leave X
Page 61 of 117
OUT
IN
and X
pin open.
OUT
since a
IN
and
OUT
Fig. 77 External circuit of ceramic resonator
Fig. 78 External circuit of RC oscillation
Fig. 79 External clock input circuit
Fig. 76 Processing of X
operation
Note:
R
X
I N
Insert a damping resistor if required.
The resistance will vary depending on the oscillator and
the oscillation drive capacity setting.
Use the value recommended by the maker of the oscillator.
Also, if the oscillator manufacturer’s data sheet specifies
that a feedback resistor be added external to the chip
though a feedback resistor exists on-chip, insert a feed-
back resistor between X
instruction.
X
I N
External oscillation
circuit
M 3 7 5 4 2
M 3 7 5 4 2
X
X
V
V
IN
C C
IN
SS
C
I N
IN
X
M37542
O U T
and X
M 3 7 5 4 2
O p e n
X
O U T
Note:
OUT
IN
Note:
and X
The clock frequency of the
on-chip oscillator depends
on the supply voltage and
the operation temperature
range.
Be careful that variable
frequencies and obtain
the sufficient margin.
R
pins at on-chip oscillator
C
X
X
O p e n
OUT
OUT
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.
R d
C
OUT
O U T
following the