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| 型號(hào)： | ST7PLITE02Y0B6 |
| 廠(chǎng)商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 44/125頁(yè) |
| 文件大?。?/td> | 1956K |
| 代理商： | ST7PLITE02Y0B6 |
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ST7LITE0x, ST7LITESx
25/125
7 SUPPLY, RESET AND CLOCK MANAGEMENT
The device includes a range of utility features for
securing the application in critical situations (for
example in case of a power brown-out), and re-
ducing the number of external components.
Main features
■ Clock Management
– 1 MHz internal RC oscillator (enabled by op-
tion byte)
– External Clock Input (enabled by option byte)
– PLL for multiplying the frequency by 4 or 8
(enabled by option byte)
■ Reset Sequence Manager (RSM)
■ System Integrity Management (SI)
– Main supply Low voltage detection (LVD) with
reset generation (enabled by option byte)
– Auxiliary Voltage detector (AVD) with interrupt
capability for monitoring the main supply (en-
abled by option byte)
7.1 INTERNAL RC OSCILLATOR ADJUSTMENT
The ST7 contains an internal RC oscillator with an
accuracy of 1% for a given device, temperature
and voltage. It must be calibrated to obtain the fre-
quency required in the application. This is done by
software writing a calibration value in the RCCR
(RC Control Register).
Whenever the microcontroller is reset, the RCCR
returns to its default value (FFh), i.e. each time the
device is reset, the calibration value must be load-
ed in the RCCR. Predefined calibration values are
stored in EEPROM for 3.0 and 5V VDD supply volt-
ages at 25°C, as shown in the following table.
Notes:
page 82. for more information on the frequency
and accuracy of the RC oscillator.
– To improve clock stability and frequency accura-
cy, it is recommended to place a decoupling ca-
pacitor, typically 100nF, between the VDD and
VSS pins as close as possible to the ST7 device.
– These two bytes are systematically programmed
by ST, including on FASTROM devices. Conse-
quently, customers intending to us e FASTROM
service must not use these two bytes.
– RCCR0 and RCCR1 calibration values will be
erased if the read-out protection bit is reset after
it has been set. See “Read out Protection” on
Caution: If the voltage or temperature conditions
change in the application, the frequency may need
to be recalibrated.
Refer to application note AN1324 for information
on how to calibrate the RC frequency using an ex-
ternal reference signal.
7.2 PHASE LOCKED LOOP
The PLL can be used to multiply a 1MHz frequen-
cy from the RC oscillator or the external clock by 4
or 8 to obtain fOSC of 4 or 8 MHz. The PLL is ena-
bled and the multiplication factor of 4 or 8 is select-
ed by 2 option bits.
– The x4 PLL is intended for operation with VDD in
the 2.4V to 3.3V range
– The x8 PLL is intended for operation with VDD in
the 3.3V to 5.5V range
Refer to Section 15.1 for the option byte descrip-
tion.
If the PLL is disabled and the RC oscillator is ena-
bled, then fOSC = 1MHz.
If both the RC oscillator and the PLL are disabled,
fOSC is driven by the external clock.
RCCR
Conditions
ST7FLITE09
Address
ST7FLITE05/
ST7FLITES5
Address
RCCR0
VDD=5V
TA=25°C
fRC=1MHz
1000h and
FFDEh
RCCR1
VDD=3.0V
TA=25°C
fRC=700KHz
1001h and-
FFDFh
1
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| ST7PLITE02Y0M6 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI |
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| ST7PLITE02Y0U6 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI |
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