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參數(shù)資料
| 型號： | M37641M8-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 105/136頁 |
| 文件大小： | 1672K |
| 代理商： | M37641M8-XXXFP |
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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 XIN and
XOUT (XCIN and XCOUT). Use the circuit constants in accordance
with the resonator manufacturer’s recommended values. No exter-
nal resistor is needed between XIN and XOUT since a feed-back
resistor exists on-chip. However, an external feed-back resistor is
needed between XCIN and XCOUT.
When using an external clock, input the clocks to the XIN or XCIN
pin and leave the XOUT or XCOUT pin open.
Immediately after power on, only the XIN oscillation circuit starts
oscillating, and XCIN and XCOUT pins function as I/O ports.
Frequency Control
The internal system clock can be selected among fSYN, f(XIN),
f(XIN)/2, and f(XCIN). The internal clock
φ is half the frequency of
internal system clock.
(1) fSYN clock
This is made by the frequency synthesizer. f(XIN) or f(XCIN) can be
selected as its input clock. See also section “FREQUENCY SYN-
THESIZER”.
(2) f(XIN) clock
The frequency of internal system clock is the frequency of XIN pin.
(3) f(XIN)/2 clock
The frequency of internal system clock is half the frequency of XIN
pin.
(4) f(XCIN) clock
The frequency of internal system clock is the frequency of XCIN
pin.
sNote
If you switch the oscillation between XIN - XOUT and XCIN - XCOUT,
stabilize both XIN and XCIN oscillations. The sufficient time is re-
quired for the XCIN 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
XCIN
XCOUT
XIN
XOUT
CIN
COUT
CCIN
CCOUT
Rf
Rd
VCC
VSS
XCIN
XCOUT
XIN
XOUT
Open
External oscillation
circuit
External oscillation
circuit
VCC
VSS
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| M37643M8-XXXHP | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37641M8-XXXHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M376420RS | 制造商:OKI 功能描述:3764-20 NOTES |
| M3764-20RS | 制造商:OKI 功能描述:3764-20 NOTES 制造商: 功能描述:Dynamic RAM, Page Mode, 64K x 1, 16 Pin, Plastic, DIP 制造商:OK International 功能描述:Dynamic RAM, Page Mode, 64K x 1, 16 Pin, Plastic, DIP |
| M3-7643A-S | 制造商:Harris Corporation 功能描述: |
| M37643F8E8-XXXFP | 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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