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ST7LITE3 Datasheet(PDF) 22 Page - STMicroelectronics

Part # ST7LITE3
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH, DATA EEPROM, ADC, TIMERS, SPI, LINSCI
Download  167 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LITE3 Datasheet(HTML) 22 Page - STMicroelectronics

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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)
– 1 to 16 MHz or 32kHz External crystal/ceramic
resonator (selected by option byte)
– External Clock Input (enabled by option byte)
– PLL for multiplying the frequency by 8 or 4
(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 device contains an internal RC oscillator with
an accuracy of 1% for a given device, temperature
and voltage range (4.5V-5.5V). It must be calibrat-
ed to obtain the frequency required in the applica-
tion. This is done by software writing a 8-bit cali-
bration value in the RCCR (RC Control Register)
and in the bits [6:5] in the SICSR (SI Control Sta-
tus 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 3V and 5V VDD supply volt-
ages at 25°C, as shown in the following table.
1. DEE0h, DEE1h, DEE2h and DEE3h addresses
are located in a reserved area but are special
bytes containing also the RC calibration values
which are read-accessible only in user mode. If all
the EEPROM data or Flash space (including the
RC calibration values locations) has been erased
(after the read out protection removal), then the
RC calibration values can still be obtained through
these four addresses.
For compatibility reasons with the SICSR register,
CR[1:0] bits are stored in the 5th and 6th position
of DEE1 and DEE3 addresses.
Note:
– See “ELECTRICAL CHARACTERISTICS” on
page 129. for more information on the frequency
and accuracy of the RC oscillator.
– To improve clock stability, it is recommended to
place a decoupling capacitor between the VDD
and VSS pins.
– These bytes are systematically programmed by
ST, including on FASTROM devices. Conse-
quently, customers intending to use FASTROM
service must not use these bytes.
– RCCR0 and RCCR1 calibration values will not
be erased if the read-out protection bit is reset af-
ter it has been set . See “Read out Protection” on
page 13.
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 2.7V 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
ST7LITE3
Addresses
RCCRH0
VDD=5V
TA=25°C
fRC=1MHz
DEE0h 1) (CR[9:2] bits)
RCCRL0
DEE1h 1) (CR[1:0] bits)
RCCRH1
VDD=3.3V
TA=25°C
fRC=1MHz
DEE2h 1) (CR[9:2] bits)
RCCRL1
DEE3h 1) (CR[1:0] bits)
1


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