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| 型號(hào)： | ST7PLU09MCTRE |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO8 |
| 封裝： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件頁(yè)數(shù)： | 45/124頁(yè) |
| 文件大?。?/td> | 1995K |
| 代理商： | ST7PLU09MCTRE |
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ST7LUS5, ST7LU05, ST7LU09
Supply, reset and clock management
27/124
6
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 reducing the number of external
components.
Main features
●
Clock Management
–
8 MHz internal RC oscillator (enabled by option byte)
–
External Clock Input (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)
6.1
Internal RC oscillator adjustment
The ST7 contains an internal RC oscillator with a specific accuracy for a given device,
temperature and voltage. It can be selected as the start up clock through the CKSEL[1:0]
option bits (see Section 14.1 on page 114). It must be calibrated to obtain the frequency
required in the application. This is done by software writing a 10-bit calibration 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), that is,
each time the device is reset, the calibration value must be loaded in the RCCR. Predefined
calibration values are stored in Flash memory for 3.3 and 5V VDD supply voltages at 25°C,
as shown in the following table.
Note:
1
In ICC mode, the internal RC oscillator is forced as a clock source, regardless of the
selection in the option byte. Refer to note 5 in Section 4.4 on page 19 for further details.
2See Chapter 12: Electrical characteristics on page 90 for more information on the frequency
and accuracy of the RC oscillator.
3
To improve clock stability and frequency accuracy, it is recommended to place a decoupling
capacitor, typically 100nF, between the VDD and VSS pins as close as possible to the ST7
device.
Caution:
If the voltage or temperature conditions change in the application, the frequency may need
to be recalibrated.
Table 6.
RCCR calibration values
RCCR
Conditions
ST7LUxx address
RCCRH0
VDD =5V, TA = 25°C, fRC =8 MHz
DEE0h(1) (CR[9:2] bits)
1.
DEE0h, DEE1h, DEE2h and DEE3h 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 Flash space (including the
RC calibration value locations) has been erased (after the readout protection removal), then the RC
calibration values can still be obtained through these two addresses.
RCCRL0
DEE1h(1) (CR[1:0] bits)
RCCRH1
VDD =3.3V, TA =25°C, fRC =8MHz
DEE2h(1) (CR[9:2] bits)
RCCRL1
DEE3h(1) (CR[1:0] bits)
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