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MC145202EVK 数据表(PDF) 6 Page - Motorola, Inc |
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MC145202EVK 数据表(HTML) 6 Page - Motorola, Inc |
6 / 48 page MC145192EVK • MC145202EVK MOTOROLA 6 Up to three EVK boards can operate independently from one printer port. All lines on the printer port are connected to every EVK. Even with three boards operating, only three output lines (Clock, Data and Load) from the printer card are used. If two boards are controlled together, data for the second board is received from the Output A of the first. Output A is a configurable output on ’192/202 devices, which in this case is used to shift data through chip 1 into chip 2. Output A and Data are connected using a printer port input line. This was done to avoid connecting extra wires. Fortunately not all port input lines are needed for computer input. Load and Clock are common to both boards. A three–board cascade is handled similarly to a two–board cascade. Out A on the first board is fed to Data on the second. Out A on the second connects to Data on the third. Instructing the program on the quantity of boards connected together allows it to modify the number of bits sent. All boards have a DIP switch S1 which gives each a unique address. The configuration menu is used to tell the program what type of board is connected at a board address. Switch positions for all possible addresses are given in Figure 2. Single Board Operation Two– or Three–Board Cascade 1 2 3 4 5 6 7 8 Closed Open Board A 1 2 3 4 5 6 7 8 Closed Open Board B 1 2 3 4 5 6 7 8 Closed Open Board C 1 2 3 4 5 6 7 8 Closed Open Figure 2. Switch Positions |
类似零件编号 - MC145202EVK |
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类似说明 - MC145202EVK |
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