參數(shù)資料
型號(hào)： ST7PLU09MCTRE
廠(chǎng)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)： 63/124頁(yè)
文件大小： 1995K
代理商： ST7PLU09MCTRE
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ST7LUS5, ST7LU05, ST7LU09
Interrupts
7.4.2
SI register description
System integrity (SI) control/status register (SICSR)
Application notes
The LVDRF flag is not cleared when another RESET type occurs (external or watchdog), the
LVDRF flag remains set to keep trace of the original failure. In this case, a watchdog reset
can be detected by software while an external reset can not.
SICSR
Reset value: 0000 0x00 (0xh)
7
654
32
10
Reserved
CR[1:0]
Reserved
LVDRF
Reserved
-
R/W
-
R/W
-
Table 19.
SICSR register description
Bit
Name
Function
7
-
Reserved, must be kept cleared.
6:5 CR[1:0]
RC Oscillator Frequency Adjustment bits
These bits, as well as CR[9:2] bits in the RCCR register must be written
immediately after reset to adjust the RC oscillator frequency and to obtain the
required accuracy. Refer to Section 6.1 on page 27.
4:3
-
Reserved, must be kept cleared
2
LVDRF
LVD reset flag
This bit indicates that the last Reset was generated by the LVD block. It is set by
hardware (LVD reset) and cleared when read. See WDGRF flag description in
Section 10.1 for more details. When the LVD is disabled by option byte, the LVDRF
bit value is undefined.
Note: If the selected clock source is one of the two internal ones, and if VDD
remains below the selected LVD threshold during less than TAWU (33s typ.), the
LVDRF flag cannot be set even if the device is reset by the LVD.
If the selected clock source is the external clock (CLKIN), the flag is never set if the
reset occurs during Halt mode. In Run mode the flag is set only if fCLKIN is greater
than 10 MHz.
1:0
-
Reserved, must be kept cleared
Table 20.
System integrity register map and reset values
Address
(Hex.)
Register
Label
76543
210
003Ah
SICSR
Reset value
01100
LVDRF
x
00
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