參數(shù)資料
型號(hào)： ST623X-KIT
英文描述： 8 MBIT (X8, BLOCK ERASE) FLASH MEMORY
中文描述： 入門套件小冊(cè)子的ST6230
文件頁(yè)數(shù)： 18/86頁(yè)
文件大小： 531K
代理商： ST623X-KIT
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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