參數(shù)資料
型號(hào)： ST62T03C
廠商： 意法半導(dǎo)體
英文描述： 8-Bit OTP MCUs with A/D Converter, Oscillator Safeguard, Safe Reset and 16 Pins(８位ＯＴＰ微處理器（８Ｍ）)
中文描述： 8位微控制器與檢察官辦公室的A / D轉(zhuǎn)換器，振蕩器保障，安全復(fù)位和16引腳（8位檢察官辦公室微處理器（8米））
文件頁(yè)數(shù)： 15/70頁(yè)
文件大?。?/td> 747K
代理商： ST62T03C
15/70
ST62T00C/T01C ST62T03C/E01C
CLOCK SYSTEM
(Cont’d)
Turning on the main oscillator is achieved by re-
setting the OSCOFF bit of the A/D Converter Con-
trol Register or by resetting the MCU. Restarting
the main oscillator implies a delay comprising the
oscillator start up delay period plus the duration of
the software instruction at f
LFAO
clock frequency.
3.1.2 Low Frequency Auxiliary Oscillator
(LFAO)
The Low Frequency Auxiliary Oscillator has three
main purposes. Firstly, it can be used to reduce
power consumption in non timing critical routines.
Secondly, it offers a fully integrated system clock,
without any external components. Lastly, it acts as
a safety oscillator in case of main oscillator failure.
This oscillator is available when the OSG ENA-
BLED option is selected. In this case, it automati-
cally starts one of its periods after the first missing
edge from the main oscillator, whatever the reason
(main oscillator defective, no clock circuitry provid-
ed, main oscillator switched off...).
User code, normal interrupts, WAIT and STOP in-
structions, are processed as normal, at the re-
duced f
LFAO
frequency. The A/D converter accura-
cy is decreased, since the internal frequency is be-
low 1MHz.
At power on, the Low Frequency Auxiliary Oscilla-
tor starts faster than the Main Oscillator. It there-
fore feeds the on-chip counter generating the POR
delay until the Main Oscillator runs.
The Low Frequency Auxiliary Oscillator is auto-
matically switched off as soon as the main oscilla-
tor starts.
ADCR
Address: 0D1h
—
Read/Write
Bit 7-3, 1-0=
ADCR7-ADCR3, ADCR1-ADCR0
:
ADC Control Register
.
These bits are not used.
Bit 2 =
OSCOFF
. When low, this bit enables main
oscillator to run. The main oscillator is switched off
when OSCOFF is high.
3.1.3 Oscillator Safe Guard
The Oscillator Safe Guard (OSG) affords drastical-
ly increased operational integrity in ST62xx devic-
es. The OSG circuit provides three basic func-
tions: it filters spikes from the oscillator lines which
would result in over frequency to the ST62 CPU; it
gives access to the Low Frequency Auxiliary Os-
cillator (LFAO), used to ensure minimum process-
ing in case of main oscillator failure, to offer re-
duced power consumption or to provide a fixed fre-
quency low cost oscillator; finally, it automatically
limits the internal clock frequency as a function of
supply voltage, in order to ensure correct opera-
tion even if the power supply should drop.
The OSG is enabled or disabled by choosing the
relevant OSG option. It may be viewed as a filter
whose cross-over frequency is device dependent.
Spikes on the oscillator lines result in an effectively
increased internal clock frequency. In the absence
of an OSG circuit, this may lead to an over fre-
quency for a given power supply voltage. The
OSG filters out such spikes (as illustrated in
Figure
9
). In all cases, when the OSG is active, the maxi-
mum internal clock frequency, f
INT
, is limited to
f
OSG
, which is supply voltage dependent. This re-
lationship is illustrated in
Figure 12
.
When the OSG is enabled, the Low Frequency
Auxiliary Oscillator may be accessed. This oscilla-
tor starts operating after the first missing edge of
the main oscillator (see
Figure 10
).
Over-frequency, at a given power supply level, is
seen by the OSG as spikes; it therefore filters out
some cycles in order that the internal clock fre-
quency of the device is kept within the range the
particular device can stand (depending on V
DD
),
and below f
OSG
: the maximum authorised frequen-
cy with OSG enabled.
Note.
The OSG should be used wherever possible
as it provides maximum safety. Care must be tak-
en, however, as it can increase power consump-
tion and reduce the maximum operating frequency
to f
OSG
.
7
0
ADCR
7
ADCR
6
ADCR
5
ADCR
4
ADCR
3
OSC
OFF
ADCR
1
ADCR
0
31
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST62T03CB6 功能描述:8位微控制器 -MCU OTP EPROM 1K No Intf RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST62T03CB6 制造商:STMicroelectronics 功能描述:IC 8BIT MCU OTP 1K 62T03 DIP16
ST62T03CM3 功能描述:8位微控制器 -MCU ST6200C ST6201C ST6203C 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST62T03CM3/TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST62T03CM6 功能描述:8位微控制器 -MCU OTP EPROM 1K No Intf RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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