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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC97338VLJ датащи(PDF) 130 Page - National Semiconductor (TI) |
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PC97338VLJ датащи(HTML) 130 Page - National Semiconductor (TI) |
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130 / 221 page  130 www.national.com FIGURE 66. CTR Register Bitmap (EPP Mode) The bits of this register have the identical function in EPP modes as in SPP modes. See Section 4.2.5 for a detailed description of each bit. 4.3.6 EPP Address Register, Offset 3 This port is added in EPP mode to enhance system throughput by enabling registers in the remote device to be directly addressed by hardware. This port can be read or written. Writing to it initiates an EPP device or register selection operation. FIGURE 67. DTR Register Bitmap (EPP Mode) 4.3.7 EPP Data Port 0, Offset 4 This is a read/write port. Accessing it initiates device read or write operations of bits 7-0. FIGURE 68. DTR Register Bitmap (EPP Mode) 4.3.8 EPP Data Port 1, Offset 5 This is the second EPP data port. It is only accessed to transfer bits 15 through 8 of a 16-bit read or write to data port 0. FIGURE 69. DTR Register Bitmap (EPP Mode) 4.3.9 EPP Data Port 2, Offset 6 This is the third EPP data port. It is only accessed to transfer bits 16 to 23 of a 32-bit read or write to data port 0. FIGURE 70. EPP Data Port 2 Bitmap 76 54 321 0 Reset Required 0 0 0 0 0 0 1 1 SPP or EPP Control Register (CTR) Offset 2 Printer Initialization Control (INIT) Interrupt Enable Direction Control Reserved Reserved Data Strobe Control Automatic Line Feed Control Parallel Port Input Control 76 54 321 0 Reset Required 0 0 0 0 0 0 0 0 EPP Address Register Offset 3 EPP Device or Register Selection 76 54 321 0 Reset Required 0 0 0 0 0 0 0 0 EPP Data Port 0 Offset 4 EPP Device Read or Write Bits 7-0 D2 D4 D5 D6 D7 D0 D1 D3 76 54 321 0 Reset Required 0 0 0 0 0 0 0 0 EPP Data Port 1 Offset 5 D10 D12 D13 D14 D15 D8 D9 D11 EPP Device Read or Write Bits 15-8 76 54 321 0 Reset Required 0 0 0 0 0 0 0 0 EPP Data Port 2 Offset 6 D18 D20 D21 D22 D23 D16 D17 D19 EPP Device Read or Write Bits 23-16 |
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