參數(shù)資料
型號： ST7FLIT19B
廠商： 意法半導體
英文描述： 8-Bit MCU With Single Voltage Flash Memory, Data EEPROM, ADC, 5 Timers, SPI(內(nèi)部RC,PLL,ADC,ROP,ICP, IAP,SPI的8位MCU)
中文描述： 8位微控制器單電壓閃存存儲器，數(shù)據(jù)EEPROM，模數(shù)轉換器，5計時器和SPI（內(nèi)部鋼筋，鎖相環(huán)，藝發(fā)局，人事，電感，國際檢察官聯(lián)合會的SPI的8位微控制器）
文件頁數(shù)： 23/155頁
文件大?。?/td> 2968K
代理商： ST7FLIT19B
ST7LITE1xB
23/155
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, available on ST7LITE15B and
ST7LITE19B devices only)
– 1 to 16 MHz External crystal/ceramic resona-
tor (selected by option byte)
– External Clock Input (enabled by option byte)
– PLL for multiplying the frequency by 8 or 4
(enabled by option byte)
– For clock ART counter only: PLL32 for multi-
plying the 8 MHz frequency by 4 (enabled by
option byte). The 8 MHz input frequency is
mandatory and can be obtained in the follow-
ing ways:
–1 MHz RC + PLLx8
–16 MHz external clock (internally divided
by 2)
–2 MHz. external clock (internally divided by
2) + PLLx8
–Crystal oscillator with 16 MHz output fre-
quency (internally divided by 2)
■
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 10-bit cali-
bration value in the RCCR (RC Control Register)
and in the bits 6:5 in the SICSR (SI Control Status
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 and 5V V
supply volt-
ages at 25°C, as shown in the following table.
1. DDE0h, DDE1h, DDE2h, and DDE3h address-
es 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 value 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.
Notes:
– In 38-pulse ICC mode, the internal RC oscillator
is forced as a clock source, regardless of the se-
lection in the option byte. For ST7LITE10B devic-
es which do not support the internal RC
oscillator, the “option byte disabled” mode must
be used (35-pulse ICC mode entry, clock provid-
ed by the tool).
– See “ELECTRICAL CHARACTERISTICS” on
page 108. 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 V
DD
and
V
SS
pins as close as possible to the ST7 device.
– These bytes are systematically programmed by
ST, including on FASTROM devices.
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 f
OSC
of 4 or 8 MHz. The PLL is ena-
RCCR
Conditions
ST7LITE1xB
Address
DEE0h
1)
(CR[9:2])
RCCRH0 V
DD
=5V
T
A
=25°C
f
RC
=1MHz
RCCRL0
DEE1h
1)
(CR[1:0])
RCCRH1 V
DD
=3.3V
T
A
=25°C
f
RC
=1MHz
DEE2h
1)
(CR[9:2])
RCCRL1
DEE3h
1)
(CR[1:0])
1
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