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LTC1272-8CCN 数据表(PDF) 15 Page - Linear Technology |
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LTC1272-8CCN 数据表(HTML) 15 Page - Linear Technology |
15 / 20 page 15 LTC1272 S APPLICATI I FOR ATIO OLD DATA DB7-DB0 NEW DATA DB11-DB8 TRACK HOLD DATA BUSY RD CS RD LTC1272 • TA19 t8 t1 t2 t3 tCONV t11 t9 t8 t9 t5 t1 t4 t5 t10 t3 t7 t3 t7 t12 t12 HBEN t7 t4 t1 t8 t9 NEW DATA DB7-DB0 t2 t4 t5 Figure 17. ROM Mode, Two Byte Read Timing Diagram Table 5. ROM Mode, Two Byte Read Data Bus Status Data Outputs D7 D6 D5 D4 D3/11 D2/10 D1/9 D0/8 First Read DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Second Read Low Low Low Low DB11 DB10 DB9 DB8 Third Read DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 ROM Mode, Two Byte READ As previously mentioned for a two byte read, only data outputs D7 . . . D0/8 are used. Conversion is started in the normal way with a Read operation and the data output status is the same as the ROM Mode, Parallel Read. See Figure 17 timing diagram and Table 5 data bus status. Two more Read operations are required to access the new conversion result. A delay equal to the LTC1272 conver- sion time must be allowed between conversion start and the second data Read operation. The second Read opera- tion, with HBEN high, disables conversion start and places the high byte (4 MSBs) on data outputs D3/11 . . . DO18. A third read operation accesses the low data byte (DB7 . . . DB0) and starts another conversion. The 4 MSB’s appear on data outputs D11 . . . D8 during all three read operations above. Microprocessor Interfacing The LTC1272 is designed to interface with microproces- sors as a memory mapped device. The CS and RD control inputs are common to all peripheral memory interfacing. The HBEN input serves as a data byte select for 8-bit processors and is normally connected to the micropro- cessor address bus. MC68000 Microprocessor Figure 18 shows a typical interface for the MC68000. The LTC1272 is operating in the Slow Memory Mode. Assum- ing the LTC1272 is located at address C000, then the following single 16-bit Move instruction both starts a conversion and reads the conversion result: Move.W $C000,D0 |
类似零件编号 - LTC1272-8CCN |
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类似说明 - LTC1272-8CCN |
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