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參數(shù)資料
| 型號： | M37512F8H-XXXHP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 51/87頁 |
| 文件大?。?/td> | 879K |
| 代理商： | M37512F8H-XXXHP |
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Feb 18, 2005
page 55 of 85
REJ03B0122-0101
7512 Group
Fig. 62 Ceramic resonator circuit
Fig. 63 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 high-speed RC oscillation or XIN and XCIN oscillation
stops. When the oscillation stabilizing time set after STP instruc-
tion released bit is “0”, the prescaler 12 is set to “FF16” and timer
1 is set to “0116”. When the oscillation stabilizing time set after
STP instruction released bit is “1”, set the sufficient time for oscil-
lation of used oscillator to stabilize since nothing is set to the
prescaler 12 and timer 1.
Either high-speed RC oscillation, XIN or XCIN divided by 16 is input
to the prescaler 12 as count source. 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 1 underflows. The
internal clock
φ is supplied for the first time, when timer 1
underflows. This ensures time for the clock oscillation using the
ceramic resonators to be stabilized. When the oscillator is re-
____________
started by reset, apply “L” level to the RESET pin until the
oscillation is stable since a wait time will not be generated.
In case of using high-speed RC oscillation circuit as main clock,
the oscillation stabilizing time does not almost need.
(2) Wait mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level, but the oscillator does not stop. The internal clock
φ re-
starts at reset or when an interrupt is received. Since the oscillator
does not stop, normal operation can be started immediately after
the clock is restarted.
To ensure that the interrupts will be received to release the STP or
WIT state, their interrupt enable bits must be set to “1” before ex-
ecuting of the STP or WIT instruction.
When releasing the STP state, the prescaler 12 and timer 1 will
start counting the clock high-speed RC oscillation, XIN divided by
16. Accordingly, set the timer 1 interrupt enable bit to “0” before
executing the STP instruction.
sNote
When using the oscillation stabilizing time set after STP instruction
released bit set to “1”, evaluate time to stabilize oscillation of the
used oscillator and set the value to the timer 1 and prescaler 12.
Fig. 64 High-speed RC oscillation circuit and 32kHz RC oscil-
lation circuit
XCIN
XCOUT
XIN
XOUT
CIN
COUT
CCIN
CCOUT
Rf
Rd
Rd (Note)
Notes : Insert a damping resistor if required.
The resistance will vary depending on the oscillator
and the oscillation drive capacity setting.
Use the value recommended by the maker of the
oscillator.
Also, if the oscillator manufacturer's data sheet
specifies that a feedback resistor be added external to
the chip though a feedback resistor exists on-chip,
insert a feedback resistor between XIN and XOUT
following the instruction.
XCIN
XCOUT
XIN
XOUT
CCIN
CCOUT
Rf
Rd
Open
External oscillation
circuit
Vcc
Vss
XIN
XOUT
XCIN
XCOUT
91k
100pF
Open
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37512F8-XXXHP | 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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| M37512FCH-XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37512FC-XXXHP | 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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