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AT89C51AC2 Datasheet(PDF) 93 Page - ATMEL Corporation |
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AT89C51AC2 Datasheet(HTML) 93 Page - ATMEL Corporation |
93 / 121 page 93 A/T89C51AC2 4127G–8051–05/06 Interrupt System Introduction The controller has a total of 8 interrupt vectors: two external interrupts (INT0 and INT1), three timer interrupts (Timers 0, 1 and 2), a serial port interrupt, a PCA, a timer overrun interrupt and an ADC. These interrupts are shown below. Figure 49. Interrupt Control System EX0 IEN0.0 00 01 10 11 External Interrupt 0 INT0# EX1 IEN0.2 External Interrupt 1 INT1# ET0 IEN0.1 Timer 0 EC IEN0.6 PCA ET1 IEN0.3 Timer 1 ES IEN0.4 UART EADC IEN1.1 A to D Converter Interrupt Enable Lowest Priority Interrupts Highest Priority Enable 00 01 10 11 00 01 10 11 00 01 10 11 00 01 10 11 00 01 10 11 00 01 10 11 Priority Interrupts AIN1:0 Timer 2 00 01 10 11 ET2 IEN0.5 TxD RxD CEX0:5 |
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