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ST7LITEUS2 数据表(PDF) 47 Page - STMicroelectronics |
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ST7LITEUS2 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 Interrupts 47/136 AVD Threshold Selection register (AVDTHCR) Refer to Section 6.3.4: AVD Threshold Selection register (AVDTHCR) for a full description of this register. 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. Bit 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 10.1.6 on page 69 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 (33us 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. 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 generated when the AVDF bit is set. Refer to Figure 17 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 is set. The pending interrupt information is automatically cleared when software enters the AVD interrupt routine. 0: AVD interrupt disabled 1: AVD interrupt enabled Table 13. System integrity register map and reset values Address (Hex.) Register label 765432 10 003Ah SICSR reset value 01100 LVDRF x AVDF 0 AVDIE 0 003Eh AVDTHCR reset value CK2 0 CK1 0 CK0 0 000 AVD1 1 AVD2 1 Obsolete Product(s) - Obsolete Product(s) |
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