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參數(shù)資料
| 型號： | ST6242BQ1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 9/69頁 |
| 文件大?。?/td> | 1846K |
| 代理商： | ST6242BQ1/XXX |
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ST62T42B/E42B
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES
3.1 CLOCK SYSTEM
3.1.1 Main Oscillator
The MCU features a Main Oscillator which can be
driven by an external clock, or used in conjunction
with an AT-cut parallel resonant crystal or a suita-
ble ceramic resonator.
Figure 8 illustrates various possible oscillator con-
figurations using an external crystal or ceramic res-
onator, an external clock input. CL1 an CL2 should
have a capacitance in the range 12 to 22 pF for an
oscillator frequency in the 4-8 MHz range.
The internal MCU clock Frequency (FINT) is divid-
ed by 13 to drive the CPU core and by 12 to drive
the A/D converter and the watchdog timer, while
clock used to drive on-chip peripherals depends
on the peripheral as shown in the clock circuit
block diagram.
With an 8MHz oscillator frequency, the fastest ma-
chine cycle is therefore 1.625s.
A machine cycle is the smallest unit of time needed
to execute any operation (for instance, to increment
the Program Counter). An instruction may require
two, four, or five machine cycles for execution.
Figure 8. Oscillator Configurations
Figure 9. Clock Circuit Block Diagram
OSCin
OSCout
CL1n
CL2
ST6xxx
CRYSTAL/RESONATOR CLOCK
OSCin
OSCout
ST6xxx
EXTERNAL CLOCK
NC
VA0016
VA0015A
MAIN
OSCILLATOR
Core
: 13
: 12
Timer 1 & 2
Watchdog
POR
fINT
ADC
OSCin
OSCout
fOSC
fINT
LCD
CONTROLLER
DRIVER
17
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相關(guān)代理商/技術(shù)參數(shù) |
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| ST6242BQ6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER |
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| ST6242Q1/XX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| ST6242Q6/XX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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