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參數(shù)資料
| 型號： | M37544 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 35/68頁 |
| 文件大?。?/td> | 579K |
| 代理商： | M37544 |
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7544 Group
Rev.1.04 2004.06.08 page 35 of 66
REJ03B0012-0104Z
Fig. 41 External circuit of ceramic resonator and quartz-crystal
oscillator
Fig. 43 External clock input circuit
Fig. 40 Processing of X
IN
and X
OUT
pins at on-chip oscillator opera-
tion
Clock Generating Circuit
An oscillation circuit can be formed by connecting a resonator be-
tween X
IN
and X
OUT
, 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 X
IN
pin to V
CC
and leave X
OUT
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 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
IN
and X
OUT
at the shortest dis-
tance. A feedback resistor is built in between pins X
IN
and X
OUT
.
(3) RC oscillation
When the RC oscillation is used for the main clock, connect the
X
IN
pin and X
OUT
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 X
IN
pin to the clock source and leave X
OUT
pin open.
Externally connect a
damping resistor Rd
depending on the oscil-
lation 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:
X
IN
X
OUT
M37544
Open
X
IN
C
OUT
C
IN
X
OUT
M37544
Rd
X
IN
X
OUT
C
R
M37544
X
IN
X
OUT
External oscillation
circuit
V
CC
V
SS
Open
M37544
Fig. 42 External circuit of RC oscillation
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| M37544G2HP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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