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參數(shù)資料
| 型號： | ST7PL05Y0MB |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 25/108頁 |
| 文件大?。?/td> | 2098K |
| 代理商： | ST7PL05Y0MB |
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ST7L0
23/108
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 8
■ Reset Sequence Manager (RSM)
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. The predefined calibration value
is stored in EEPROM for 5V VDD supply voltage at
25°C, as shown in the following table.
Notes:
page 72. 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.
– This byte is systematically programmed by ST,
including on FASTROM devices. Consequently,
customers intending to us e FASTROM service
must not use this byte.
– RCCR0 and RCCR1 calibration values are
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 re-
quire recalibration.
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 is used to multiply a 1 MHz frequency
from the RC oscillator or the external clock by 8 to
obtain fOSC of 8 MHz. The PLL is enabled (by 1 op-
tion bit) and the multiplication factor is 8.
The x8 PLL is intended for operation with VDD in
the 3.6 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 = 1 MHz.
If both the RC oscillator and the PLL are disabled,
fOSC is driven by the external clock.
Figure 11. PLL Output Frequency Timing
Diagram
When the PLL is started, after reset or wakeup
from Halt mode or AWUFH mode, it outputs the
clock after a delay of tSTARTUP.
When the PLL output signal reaches the operating
frequency, the LOCKED bit in the SICSCR register
is set. Full PLL accuracy (ACCPLL) is reached after
RCCR
Conditions
ST7FL09
Address
ST7FL05
Address
RCCR0
VDD = 5V
TA = 25°C
fRC = 1 MHz
1000h and
FFDEh
RCCR1
VDD = 3.3V
TA = 25°C
fRC = 700 kHz
1001h and
FFDFh
8 x
freq.
LOCKED bit set
tSTAB
tLOCK
input
Ou
tp
ut
fr
eq
.
tSTARTUP
t
1
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