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PC87365 データシート(PDF) 35 Page - National Semiconductor (TI) |
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PC87365 データシート(HTML) 35 Page - National Semiconductor (TI) |
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35 / 215 page  2.0 Device Architecture and Configuration (Continued) 35 www.national.com Table 10. Interrupt Configuration Registers Table 11. DMA Configuration Registers Table 12. Special Logical Device Configuration Registers Index Register Name Description 70h Interrupt Number and Wake-Up on IRQ Enable Sets IRQ, indicates the selected interrupt number and enables wake-up on IRQ. Bit 4 - Enables wake-up on the IRQ of the logical device. When enabled, IRQ assertion triggers a wake-up event. 0: Disabled (default) 1: Enabled Bits 3-0 select the interrupt number. A value of 1 selects IRQL1. A value of 15 selects IRQL15. IRQL0 is not a valid interrupt selection and represent no interrupt selection. Note: If the BIOS routine that sets IRQ does not use a Read-Modify-Write sequence, it might reset bit 4. To ensure that the system wakes up, the BIOS must set bit 4 before the system goes to sleep. 71h Interrupt Request Type Select Indicates the type and level of the interrupt request level selected in the previous register. If a logical device supports only one type of interrupt, this register may be read only. Bits 7-2 - Reserved. Bit 1 - Level of the interrupt request selected in the previous register 0: Low polarity 1: High polarity Bit 0 - Type of interrupt request selected in the previous register 0: Edge 1: Level Index Register Name Description 74h DMA Channel Select 0 Indicates selected DMA channel for DMA 0 of the logical device (0 - The first DMA channel in case of using more than one DMA channel). Bits 2-0 select the DMA channel for DMA 0. The valid choices are 0-3, where a value of 0 selects DMA channel 0, 1 selects channel 1, etc. A value of 4 indicates that no DMA channel is active. The values 5-7 are reserved. 75h DMA Channel Select 1 Indicates selected DMA channel for DMA 1 of the logical device (1 - The second DMA channel in case of using more than one DMA channel). Bits 2-0 select the DMA channel for DMA 1. The valid choices are 0-3, where a value of 0 selects DMA channel 0, 1 selects channel 1, etc. A value of 4 indicates that no DMA channel is active. The values 5-7 are reserved. Index Register Name Description F0h-FEh Logical Device Configuration Special (vendor-defined) configuration options. |
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