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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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AT89LP6440 bảng dữ liệu(PDF) 82 Page - ATMEL Corporation |
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AT89LP6440 bảng dữ liệu(HTML) 82 Page - ATMEL Corporation |
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82 / 194 page  82 3706A–MICRO–9/09 AT89LP6440 - Preliminary another interrupt will be generated. Both INT0 and INT1 may wake up the device from the Power-down state. 15. General-purpose Interrupts The General-purpose Interrupt (GPI) function provides 8 configurable external interrupts on Port 1. Each port pin can detect high/low levels or positive/negative edges. The GPIEN register select which bits of Port 1 are enabled to generate an interrupt. The GPMOD and GPLS regis- ters determine the mode for each individual pin. GPMOD selects between level-sensitive and edge-triggered mode. GPLS selects between high/low in level mode and positive/negative in edge mode. A block diagram is shown in Figure 15-1. The pins of Port 1 are sampled every clock cycle. In level-sensitive mode, a valid level must appear in two successive samples before generating the interrupt. In edge-triggered mode, a transition will be detected if the value changes from one sample to the next. When an interrupt condition on a pin is detected, and that pin is enabled, the appropriate flag in the GPIF register is set. The flags in GPIF must be cleared by software. Any GPI interrupt may wake up the device from the Power-down state. Figure 15-1. GPI Block Diagram DQ 2 2 2 2 00 1 1 (P1.2) GPI2 DQ 1 1 1 1 00 1 1 (P1.1) GPI1 DQ 0 0 0 0 00 1 1 (P1.0) GPI0 DQ 3 3 3 3 00 1 1 (P1.3) GPI3 DQ 6 6 6 6 00 1 1 (P1.6) GPI6 DQ 5 5 5 5 00 1 1 (P1.5) GPI5 DQ 4 4 4 4 00 1 1 (P1.4) GPI4 DQ 7 7 7 7 00 1 1 (P1.7) GPI7 GPMOD GPLS GPIEN GPIF Interrupt CLK |
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