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參數(shù)資料
| 型號： | M38073E4-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 46/74頁 |
| 文件大?。?/td> | 1182K |
| 代理商： | M38073E4-XXXFP |
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50
MITSUBISHI MICROCOMPUTERS
3807 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
("0") before executing the STP instruction. Oscillator restarts when
an external interrupt is received, but the internal clock
φ is not sup-
plied to the CPU (remains at "H") until timer 2 underflows. This al-
lows time for the clock circuit oscillation to stabilize. The internal clock
φ is supplied for the first time, when timer 2 underflows. Therefore
make sure not to set the timer 2/INT3 interrupt request bit to "1" be-
fore the STP instruction stops the oscillator. When the
______
oscillator is restarted by reset apply "L" level to port RESET until the
oscillation is stable since a wait time will not be generated.
(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 before
executing the WIT instruction. The internal clock restarts at reset or
when an interrupt is received. Since the oscillator does not stop, nor-
mal operation can be started immediately after the clock is restarted.
Clock Generating Circuit
The 3807 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
external 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.
Immediately after poweron, only the XIN oscillation circuit starts
oscillating, and XCIN and XCOUT pins function as I/O ports.
qFrequency 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
The internal clock
φ is half the frequency of XCIN.
sNote
If you switch the mode between middle/high-speed and low-speed,
stabilize both XIN and XCIN oscillations. The sufficient time is required
for the sub clock to stabilize, especially 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).
(4) Low power consumption mode
The low power consumption operation can be realized by stopping
the main clock XIN in low-speed mode. To stop the main clock, set bit
5 of the CPU mode register to "1." When the main clock XIN is re-
started (by setting the main clock stop bit to "0"), set enough time for
oscillation to stabilize.
By clearing furthermore the XCOUT drivability selection bit (b3) of CPU
mode register to "0", low power consumption operation of less than
55
A (VCC=3 V, XCIN=32 kHz) can be realized by reducing the
drivability between XCIN and XCOUT. At reset or during STP instruc-
tion execution this bit is set to "1" and a reduced drivability that has
an easy oscillation start is set. The sub-clock XCIN-XCOUT oscillating
circuit can not directly input clocks that are generated externally. Ac-
cordingly, make sure to cause an external resonator to oscillate.
qOscillation 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. Timer 1 is set to "FF16" and
timer 2 is set to "0116."
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 timer 3 count source selection bit (b4) are
cleared to "0". Set the timer 2/INT3 interrupt source bit to "1" and
timer 1/INT2 as well as timer 2/INT3 interrupt enable bit to disabled
XCIN
XCOUT
XIN
XOUT
CIN
COUT
CCIN
CCOUT
Rf
Rd
XIN
XOUT
External oscillation circuit
VCC
VSS
open
CCIN
CCOUT
Rf
Rd
XCIN
XCOUT
Fig. 56. External clock input circuit
Fig. 55. Ceramic resonator circuit
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相關(guān)代理商/技術(shù)參數(shù) |
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| M38078RFS | 制造商:Renesas Electronics Corporation 功能描述:EMULATION MCU/8BIT CMOS EMULATION CHIP - Bulk |
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| M3808 BK001 | 制造商:Alpha Wire Company 功能描述:CBL 10COND 18AWG BLK 1000' |
| M3808 BK002 | 制造商:Alpha Wire Company 功能描述:CBL 10COND 18AWG BLK 500' |
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