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参数资料
| 型号： | ST6235BQ1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP52 |
| 封装： | PLASTIC, QFP-52 |
| 文件页数： | 10/82页 |
| 文件大小： | 617K |
| 代理商： | ST6235BQ1/XXX |
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18/82
ST62T35B/E35B
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES
3.1 CLOCK SYSTEM
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. In addition, a Low Frequen-
cy Auxiliary Oscillator (LFAO) can be switched in
for security reasons, to reduce power consump-
tion, or to offer the benefits of a back-up clock sys-
tem.
The Oscillator Safeguard (OSG) option filters
spikes from the oscillator lines, provides access to
the LFAO to provide a backup oscillator in the
event of main oscillator failure and also automati-
cally limits the internal clock frequency (fINT)as a
function of VDD, in order to guarantee correct op-
eration. These functions are illustrated in Figure
9., Figure 10., Figure 11. and Figure 12..
Figure 8. illustrates various possible oscillator con-
figurations using an external crystal or ceramic res-
onator, an external clock input or the lowest cost so-
lution using only the LFAO. CL1 an CL2 should have
a capacitance in the range 12 to 22 pF for an os-
cillator frequency in the 4-8 MHz range.
The internal MCU clock frequency (fINT) is divided
by 12 to drive the Timer and the Watchdog timer,
and by 13 to drive the CPU core, while the A/D
converter is driven by fINT divided either by 6 or by
12 as may be seen inFigure 11..
With an 8MHz oscillator frequency, the fastest
machine cycle is therefore 1.625
s.
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.
3.1.1 Main Oscillator
The main oscillator can be turned off (when the
OSG ENABLED option is selected) by setting the
OSCOFF bit of the OSCR Control Register. The
Low Frequency Auxiliary Oscillator is automatical-
ly started.
Figure 8. Oscillator Configurations
INTEGR ATED CLOCK
OSG ENABLED option
OSCin
OSCout
CL1n
CL2
ST6xxx
CRYSTAL/RESON ATOR CLOCK
OSCin
OSCout
ST6xxx
EXTER NAL CLOCK
NC
OSCin
OSCout
ST6xxx
NC
VA0016
VA0015A
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST6235BQ3 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART |
| ST6235BQ3/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST6235BQ6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART |
| ST6235BQ6/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST623X | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8/16-Bit Micros |
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