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W78L801P-24 Datasheet(PDF) 8 Page - Winbond |
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W78L801P-24 Datasheet(HTML) 8 Page - Winbond |
8 / 24 page W78L801 - 8 - is set to 1. i.e. User’s applications should elude the ALE pulses before software configure it with I/O port P4.5. Bit: 7 6 5 4 3 2 1 0 - P4.6 P4.5 - P4.3 P4.2 P4.1 P4.0 Mnemonic: P4 Address: D8H 6.1 Interrupt System The W78L801 has twelve interrupt sources: INT0 and INT1; Timer 0,1; INT2 to INT9. Each interrupt vectors to a specific location in program memory for its interrupt service routine. Each of these sources can be individually enabled or disabled by setting or clearing the corresponding bit in Special Function Register IE0 and IE1. The individual interrupt priority level depends on the Interrupt Priority Register IP0 and IP1. Additional external interrupts INT2 to INT9 are level sensitive and may be used to awake the device from power down mode. The Port 1 interrupts can be initialized to either active HIGH or LOW via setting the Interrupt Polarity Register IX. The IRQ register contains the flags of Port 1 interrupts. Each flag in IRQ register will be set when an interrupt request is recognized but must be cleared by software . Note that the interrupt flags have to be cleared before the interrupt service routine is completed, or else another interrupt will be generated. Interrupt Enable Register 0 Bit: 7 6 5 4 3 2 1 0 EA - - - ET1 EX1 ET0 EX0 Mnemonic: IE Address: A8H EA : Global enable. Enable/disable all interrupts. ET1: Enable Timer 1 interrupt EX1: Enable external interrupt 1 ET0: Enable Timer 0 interrupt EX0: Enable external interrupt 0 Interrupt Enable Register 1 Bit: 7 6 5 4 3 2 1 0 EX9 EX8 EX7 EX6 EX5 EX4 EX3 EX2 Mnemonic: IE1 Address: E8H EX9: Enable external interrupt 9 EX8: Enable external interrupt 8 EX7: Enable external interrupt 7 EX6: Enable external interrupt 6 EX5: Enable external interrupt 5 EX4: Enable external interrupt 4 EX3: Enable external interrupt 3 EX2: Enable external interrupt 2 |
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