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HT68F13 Datasheet(PDF) 119 Page - Holtek Semiconductor Inc |
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HT68F13 Datasheet(HTML) 119 Page - Holtek Semiconductor Inc |
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119 / 161 page  If the system is woken up by an interrupt, then two possible situations may occur. The first is where the related interrupt is disabled or the interrupt is enabled but the stack is full, in which case the program will resume execution at the instruction following the HALT instruction. In this situation, the interrupt which woke-up the device will not be immediately serviced, but will rather be serviced later when the related interrupt is finally enabled or when a stack level becomes free. The other situation is where the related interrupt is enabled and the stack is not full, in which case the regular interrupt response takes place. If an interrupt request flag is set high before entering the SLEEP or IDLE Mode, the wake-up function of the related interrupt will be disabled. LowVoltageDetector - LVD Each device has a Low Voltage Detector function, also known as LVD. This enabled the device to monitor the power supply voltage, VDD, and provide a warning signal should it fall below a certain level. This function may be especially useful in battery applications where the supply voltage will gradually reduce as the battery ages, as it allows an early warning battery low signal to be generated. The Low Voltage Detector also has the capability of generating an interrupt signal. LVD Register The Low Voltage Detector function is controlled using a single register with the name LVDC. Three bits in this register, VLVD2~VLVD0, are used to select one of eight fixed voltages below which a low voltage condition will be determined. A low voltage condition is indicated when the LVDO bit is set. If the LVDO bit is low, this indicates that the VDD voltage is above the preset low voltage value. The LVDEN bit is used to control the overall on/off function of the low voltage detector. Setting the bit high will enable the low voltage detector. Clearing the bit to zero will switch off the internal low voltage detector circuits. As the low voltage detector will consume a certain amount of power, it may be desirable to switch off the circuit when not in use, an important consideration in power sensitive battery powered applications. LVDC Register Bit 7 6 5 4 3 2 1 0 Name ¾ ¾ LVDO LVDEN ¾ VLVD2 VLVD1 VLVD0 R/W ¾ ¾ R R/W ¾ R/W R/W R/W POR ¾ ¾ 0 0 ¾ 0 0 0 Bit7~6 unimplemented,readas ²0² Bit5 LVDO: LVD OutputFlag 0:nolowvoltagedetect 1:lowvoltagedetect Bit LVDEN:lowvoltagedetectorcontrol 0:disable 1:enable Bit3 unimplemented,readas ²0² Bit2~0 VLVD2~VLVD0:select LVD voltage 000:2.0V 001:2.2V 010:2.4V 011:2.7V 100:3.0V 101:3.3V 110:3.6V 111:4.4V Rev.1.10 119 February9,2011 HT68F13/HT68F14/HT68F15 EnhancedI/OFlashTypeMCU |
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