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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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IRCC2.0 数据表(PDF) 7 Page - SMSC Corporation |
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IRCC2.0 数据表(HTML) 7 Page - SMSC Corporation |
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7 / 87 page  7 Table 7 - IrCC 2.0-Specific Chip-Level Controls NAME SIZE (BITS) TYPE DESCRIPTION DMA Channel 4 Input ISA DMA Channel Number IRQ Level 4 Input ISA Interrupt Level Software Select A 8 Input Software Programmable Register A Software Select B 8 Input Software Programmable Register B DMA Channel 4 bit bus from a chip-level configuration register, used to identify the current IrCC 2.0 DMA channel number. The value appears in the upper nibble of IrCC 2.0 Register Block Three, Address Four. IRQ Level 4 bit bus from a chip-level configuration register, used to identify the current IrCC 2.0 IRQ level. The value appears in the lower nibble of IrCC 2.0 Register Block Three, Address Four. Software Select A/B The 8 bit Software Select A and Software Select B inputs come from software-only programmable chip-level configuration controls. The values on these buses appear in IrCC 2.0 Register Block Three, Addresses Five and Six. |
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