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参数资料
| 型号： | M37540M2T-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP32 |
| 封装： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件页数： | 39/88页 |
| 文件大小： | 872K |
| 代理商： | M37540M2T-XXXFP |
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7540 Group
Rev.4.00
Jun 21, 2004
page 44 of 82
REJ03B0011-0400Z
Fig. 46 External circuit of ceramic resonator
Fig. 47 External circuit of RC oscillation
XIN
COUT
CIN
XOUT
M37540
Rd
XIN
XOUT
C
R
M37540
Fig. 48 External clock input circuit
XIN
XOUT
External oscillation
circuit
VCC
VSS
Open
M37540
XIN
XOUT
M37540
Open
Fig. 49 Processing of XIN and XOUT pins at on-chip oscillator
operation
Clock Generating Circuit
An oscillation circuit can be formed by connecting a resonator be-
tween XIN and XOUT, and an RC oscillation circuit can be formed
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 XIN pin to VSS and leave XOUT 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 XIN and
XOUT at the shortest distance. A feedback resistor is built in be-
tween pins XIN and XOUT.
(3) RC oscillation
When the RC oscillation is used for the main clock, connect the
XIN pin and XOUT pin to the external circuit of resistor R and the
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 XIN pin to the clock source and leave XOUT pin open.
Externally connect a
damping resistor Rd de-
pending
on
the
oscillation frequency.
(A feedback resistor is
built-in.)
Use
the
resonator
manufacturer’s recom-
mended value because
constants such as ca-
pacitance depend on the
resonator.
Note:
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.
Note:
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:
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PDF描述 |
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| M30624MGP-XXXGP | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP100 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37540M2T-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540M2V-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37540M2V-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540M2-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540M2-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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