參數(shù)資料
型號： 7641
英文描述： 7641 Group Datasheet Datasheet 2145K/MAR.26.02
中文描述： 7641組數(shù)據(jù)表數(shù)據(jù)表2145K/MAR.26.02
文件頁數(shù)： 71/137頁
文件大?。?/td> 2145K
代理商： 7641
70
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
CLOCK GENERATING CIRCUIT
The 7641 group has two built-in oscillation circuits. An oscillation
circuit can be formed by connecting a resonator between X
IN
and
X
OUT
(X
CIN
and X
COUT
). Use the circuit constants in accordance
with the resonator manufacturer
’
s recommended values. No exter-
nal resistor is needed between X
IN
and X
OUT
since a feed-back
resistor exists on-chip. However, an external feed-back resistor is
needed between X
CIN
and X
COUT
.
When using an external clock, input the clocks to the X
IN
or X
CIN
pin and leave the X
OUT
or X
COUT
pin open.
Immediately after power on, only the X
IN
oscillation circuit starts
oscillating, and X
CIN
and X
COUT
pins function as I/O ports.
Frequency Control
The internal system clock can be selected among f
SYN
, f(X
IN
),
f(X
IN
)/2, and f(X
CIN
). The internal clock
φ
is half the frequency of
internal system clock.
(1) f
SYN
clock
This is made by the frequency synthesizer. f(X
IN
) or f(X
CIN
) can be
selected as its input clock. See also section
“
FREQUENCY SYN-
THESIZER
”
.
(2) f(X
IN
) clock
The frequency of internal system clock is the frequency of X
IN
pin.
(3) f(X
IN
)/2 clock
The frequency of internal system clock is half the frequency of X
IN
pin.
(4) f(X
CIN
) clock
The frequency of internal system clock is the frequency of X
CIN
pin.
I
Note
If you switch the oscillation between X
IN
- X
OUT
and X
CIN
- X
COUT
,
stabilize both X
IN
and X
CIN
oscillations. The sufficient time is re-
quired for the X
CIN
oscillation to stabilize, especially immediately
after power on and at returning from the stop mode.
Fig. 64 Ceramic resonator or quartz-crystal oscillator exter-
nal circuit
Fig. 65 External clock input circuit
X
CIN
X
COUT
X
IN
X
OUT
C
IN
C
OUT
C
CIN
C
COUT
Rf
Rd
V
CC
V
SS
X
CIN
X
COUT
X
IN
X
OUT
Open
Open
External oscillation
circuit
External oscillation
circuit
V
CC
V
SS
相關PDF資料
PDF描述
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相關代理商/技術參數(shù)
參數(shù)描述
764-1"x36yd-Black 功能描述:膠帶 BLACK 1X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds
764-1"x36yd-Blue 功能描述:膠帶 764 BLUE 1X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds
764-1"x36yd-Green 功能描述:膠帶 GREEN 1X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds
764-1"x36yd-Orange 功能描述:膠帶 764 ORANGE 1X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds
764-1"x36yd-Red 功能描述:膠帶 764 RED 1X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds
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