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參數(shù)資料
| 型號： | ST623X-DBE |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | D/A Converter (D-A) IC; Resolution (Bits):24; Update Rate:192kSPS; No. of DACs:6; Data Interface:Serial; Package/Case:48-LQFP; Leaded Process Compatible:No; No. of Bits:24; No. of Channels:6; Operating Temp. Max:85 C RoHS Compliant: Yes |
| 中文描述： | 實時仿真開發(fā)工具，ST6單片機系列 |
| 文件頁數(shù)： | 18/86頁 |
| 文件大?。?/td> | 531K |
| 代理商： | ST623X-DBE |
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18/86
ST62T30B ST62E30B
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES
3.1 CLOCK SYSTEM
The MCU featuresa 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 (f
INT
) as a
function ofV
DD
, inorder toguarantee correct oper-
ation. These functions are illustrated in Figure 9,
Figure 10, Figure 11 and Figure 12.
Figure 8 illustrates various possible oscillator con-
figurations using anexternal crystal or ceramic res-
onator,anexternal clockinput orthelowestcostso-
lution usingonlythe LFAO. C
L1
an C
L2
shouldhave
acapacitanceintherange12to22pFforanoscillator
frequency in the 4-8 MHz range.
The internal MCU clock frequency (f
INT
) 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 f
INT
divided either by 6 or by
12 as may be seen in Figure 11.
With an 8MHz oscillator frequency, thefastest ma-
chine cycle is therefore 1.625
μ
s.
A machine cycle is thesmallest unitof timeneeded
to executeanyoperation(forinstance,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
INTEGRATEDCLOCK
OSG ENABLED option
OSC
in
OSC
out
C
L1n
C
L2
ST6xxx
CRYSTAL/RESONATOR CLOCK
OSC
in
OSC
out
ST6xxx
EXTERNAL CLOCK
NC
OSC
in
OSC
out
ST6xxx
NC
VA0016
VA0015A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST623X-EMU2 | 制造商:STMicroelectronics 功能描述:ST62 EMULATOR |
| ST623X-KIT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:STARTER KIT DATASHEET FOR ST6230 |
| ST623X-KIT/110 | 功能描述:開發(fā)板和工具包 - 其他處理器 ST623X Starter Kit RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| ST623X-KIT/220 | 制造商:STMicroelectronics 功能描述:ST Development Kit, Including ST623X Starter Kit, Development Software CD-ROM, Parallel Cable, Power Supply, Window Development Devices ST62E30BF1, ST (More...) |
| ST623X-KIT/UK | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:STARTER KIT AB 8K BYTE |
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