参数资料
型号: ST7FLITE09Y0B3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP16
封装: 0.300 INCH, PLASTIC, DIP-16
文件页数: 40/115页
文件大小: 781K
代理商: ST7FLITE09Y0B3
ST7FLITE0
30/115
SYSTEM INTEGRITY MANAGEMENT (Cont’d)
7.5.4 Register Description
SYSTEM INTEGRITY (SI) CONTROL/STATUS REGISTER (SICSR)
Read/Write
Reset Value: 0000 0x00 (0xh)
Bit 7:4 = Reserved, must be kept cleared.
Bit 3 = LOCKED
PLL Locked Flag
This bit is set and cleared by hardware. It is set au-
tomatically when the PLL reaches its operating fre-
quency.
0: PLL not locked
1: PLL locked
Bit 2 = LVDRF
LVD reset flag
This bit indicates that the last Reset was generat-
ed by the LVD block. It is set by hardware (LVD re-
set) and cleared by software (writing zero). See
WDGRF flag description in Section 11.1 for more
details. When the LVD is disabled by OPTION
BYTE, the LVDRF bit value is undefined.
Bit 1 = AVDF
Voltage Detector flag
This read-only bit is set and cleared by hardware.
If the AVDIE bit is set, an interrupt request is gen-
erated when the AVDF bit changes value. Refer to
Figure 18 for additional details
0: VDD over AVD threshold
1: VDD under AVD threshold
Bit 0 = AVDIE
Voltage Detector interrupt enable
This bit is set and cleared by software. It enables
an interrupt to be generated when the AVDF flag
changes (toggles). The pending interrupt informa-
tion is automatically cleared when software enters
the AVD interrupt routine.
0: AVD interrupt disabled
1: AVD interrupt enabled
Application notes
The LVDRF flag is not cleared when another RE-
SET type occurs (external or watchdog), the
LVDRF flag remains set to keep trace of the origi-
nal failure.
In this case, a watchdog reset can be detected by
software while an external reset can not.
Table 6. System Integrity Register Map and Reset Values
70
00
LOCK
ED
LVDRF AVDF AVDIE
Address
(Hex.)
Register
Label
765
4
321
0
003Ah
SICSR
Reset Value
000
0
LOCKED
0
LVDRF
x
AVDF
0
AVDIE
0
1
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