- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45045 > M38277M8MXXXFP 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP100 PDF資料下載
參數(shù)資料
| 型號： | M38277M8MXXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 40/70頁 |
| 文件大?。?/td> | 1112K |
| 代理商： | M38277M8MXXXFP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁當(dāng)前第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁
45
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3827 Group
CLOCK GENERATING CIRCUIT
The 3827 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.
To supply a clock signal externally, input it to the XIN pin and make
the XOUT pin open. The sub-clock XCIN-XCOUT oscillation circuit
cannot directly input clocks that are externally generated. Accord-
ingly, be sure to cause an external resonator to oscillate.
Immediately after poweron, only the XIN oscillation circuit starts
oscillating, and XCIN and XCOUT pins go to high impedance state.
Frequency Control
(1) Middle-speed Mode
The internal clock
φ is the frequency of XIN divided by 8.
After reset, this mode is selected.
(2) High-speed Mode
The internal clock
φ is half the frequency of XIN.
(3) Low-speed Mode
qThe internal clock
φ is half the frequency of XCIN.
qA low-power consumption operation can be realized by stopping
the main clock XIN in this mode. To stop the main clock, set bit 5
of the CPU mode register to “1”.
When the main clock XIN is restarted, set enough time for oscil-
lation to stabilize by programming.
Note: If you switch the mode between middle/high-speed and low-
speed, stabilize both X IN and XCIN oscillations. The
sufficient time is required for the sub-clock to stabilize, es-
pecially immediately after poweron and at returning from
stop mode. When switching the mode between middle/high-
speed and low-speed, set the frequency on condition that
f(XIN)>3f(XCIN).
Fig. 51 Ceramic resonator circuit
Fig. 52 External clock input circuit
Oscillation Control
(1) Stop Mode
If the STP instruction is executed, the internal clock
φ stops at an
“H” level, and XIN and XCIN oscillators stop. The value set to the
timer latch 1 and the timer latch 2 is loaded automatically to the
timer 1 and the timer 2. Thus, a value generated time for stabiliz-
ing oscillation should be set to the timer 1 latch and the timer 2
latch (low-order 8 bits for the timer 1, high-order 8 bits for the timer
2) before executing the STP instruction.
Either XIN or XCIN divided by 16 is input to timer 1 as count
source, and the output of timer 1 is connected to timer 2. The bits
of the timer 123 mode register except bit 4 are cleared to “0,” Set
the timer 1 and timer 2 interrupt enable bits to disabled (“0”) before
executing the STP instruction. Oscillator restarts at reset or when
an external interrupt is received, but the internal clock
φ is not sup-
plied to the CPU until timer 2 underflows..This allows timer for the
clock circuit oscillation to stabilize.
(2) Wait Mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level. The states of XIN and XCIN are the same as the state be-
fore the executing the WIT instruction. The internal clock restarts
at reset or when an interrupt is received. Since the oscillator does
not stop, normal operation can be started immediately after the
clock is restar ted.
XCIN
XCOUT
XIN
XOUT
CIN
COUT
CCIN
CCOUT
Rf
Rd
XIN
XOUT
External oscillation
circuit
Open
VCC
VSS
CCIN
CCOUT
Rf
Rd
XCIN
XCOUT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M38279EFFP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP100 |
| M38279EFFS | 8-BIT, UVPROM, 4 MHz, MICROCONTROLLER, CQCC100 |
| M38503E4SP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42 |
| M38503E4FP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| M38503M6-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M3828 BK001 | 制造商:Alpha Wire Company 功能描述:CBL 3COND 16AWG BLK 1000' |
| M3828 BK002 | 制造商:Alpha Wire Company 功能描述:CBL 3COND 16AWG BLK 500' |
| M3828 BK005 | 制造商:Alpha Wire Company 功能描述:CBL 3COND 16AWG BLK 100' |
| M3828 BK199 | 制造商:Alpha Wire Company 功能描述:CBL 3COND 16AWG BLK 3000=3000' |
| M3829 BK001 | 制造商:Alpha Wire Company 功能描述:CBL 4COND 16AWG BLK 1000' |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。