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HT68F13 Datasheet(PDF) 114 Page - Holtek Semiconductor Inc |
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HT68F13 Datasheet(HTML) 114 Page - Holtek Semiconductor Inc |
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114 / 161 page  ExternalInterrupt The external interrupts are controlled by signal transitions on the pins INT0~INT1. An external interrupt request will take place when the external interrupt request flags, INT0F~INT1F, are set, which will occur when a transition, whose type is chosen by the edge select bits, appears on the external interrupt pins. To allow the program to branch to its respective interrupt vector address, the global interrupt enable bit, EMI, and respective external interrupt enable bit, INT0E~INT1E, must first be set. Additionally the correct interrupt edge type must be selected using the INTEG register to enable the external interrupt function and to choose the trigger edge type. As the external interrupt pins are pin-shared with I/O pins, they can only be configured as external interrupt pins if their external interrupt enable bit in the corresponding interrupt register has been set. The pin must also be setup as an input by setting the corresponding bit in the port control register. When the interrupt is enabled, the stack is not full and the correct transition type appears on the external interrupt pin, a subroutine call to the external interrupt vector, will take place. When the interrupt is serviced, the external interrupt request flags, INT0F~INT1F, will be automatically reset and the EMI bit will be automatically cleared to disable other interrupts. Note that any pull-high resistor selections on the external interrupt pins will remain valid even if the pin is used as an external interrupt input. The INTEG register is used to select the type of active edge that will trigger the external interrupt. A choice of either rising or falling or both edge types can be chosen to trigger an external interrupt. Note that the INTEG register can also be used to disable the external interrupt function. HT68F13/HT68F14/HT68F15 EnhancedI/OFlashTypeMCU Rev.1.10 114 February9,2011 INT0 Pin INT1 Pin INT0F INT1F INT0E INT1E EMI 04H EMI 08H M. Funct. 0 MF0F MF0E EMI 0CH EMI 10H Time Base TBF TBE EMI 18H LVD LVF LVE EMI 1CH Interrupt Name Request Flags Enable Bits Master Enable Vector EMI auto disabled in ISR Low TM1 P T1PF T1PE TM1 A T1AF T1AE M. Funct. 1 MF1F MF1E TM0 P T0PF T0PE TM0 A T0AF T0AE Interrupts contained within Multi-Function Interrupts TM1 B T1BF T1BE Priority High xxE Enable Bits xxF Request Flag, auto reset in ISR Legend xxF Request Flag, no auto reset in ISR InterruptStructure - HT68F15 |
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