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DS2406+R 数据表(PDF) 21 Page - Dallas Semiconductor |
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DS2406+R 数据表(HTML) 21 Page - Dallas Semiconductor |
21 / 31 page DS2406 21 of 31 Conditional Search ROM [ECh] The Conditional Search ROM command operates similarly to the Search ROM command except that only devices fulfilling the specified condition will participate in the search. This command provides an efficient means for the bus master to identify devices in a multidrop system that have to signal a status change, e.g. the opening of a window in a building control application. The condition is specified by the bit functions CSS0 to CSS4 in Status Memory location 7. At power-on all these bits are 1s. They can be changed by means of the Write Status command. As long as the device remains powered up, the modified search conditions are available for use at any time. For the conditional search, one can specify the polarity (HIGH or LOW; CSS0), the source (PIO-pin, channel flip flop or activity latch; CSS1, CSS2), and the channel of interest (A, B or the logical OR of A, B; CSS3, CSS4). Table 2 shows all qualifying conditions and the required settings for CSS0 to CSS4. QUALIFYING CONDITIONS FOR CONDITIONAL SEARCH Table 2 DESCRIPTION CONDITIONAL SEARCH SELECT CODE CHANNEL SELECT SOURCE SELECT POLARITY CONDITION CHANNEL CSS4 CSS3 CSS2 CSS1 CSS0 RESERVED Don’t care 0 0 0/1 Unconditional neither one 0 0 At least one of these bits needs to be 1 0 Activity Latch = 0 A 0 1 0 1 0 Activity Latch = 1 A 0 1 0 1 1 Channel FF = 0 (transistor on) A 0 1 1 0 0 Channel FF = 1 (transistor off) A 0 1 1 0 1 PIO Low A 0 1 1 1 0 PIO High A 0 1 1 1 1 Activity Latch = 0 B 1 0 0 1 0 Activity Latch = 1 B 1 0 0 1 1 Channel FF = 0 (transistor on) B 1 0 1 0 0 Channel FF = 1 (transistor off) B 1 0 1 0 1 PIO Low B 1 0 1 1 0 PIO High B 1 0 1 1 1 Activity Latch = 0 A or B 1 1 0 1 0 Activity Latch = 1 A or B 1 1 0 1 1 Channel FF = 0 (transistor on) A or B 1 1 1 0 0 Channel FF = 1 (transistor off) A or B 1 1 1 0 1 PIO Low A or B 1 1 1 1 0 PIO High A or B 1 1 1 1 1 |
类似零件编号 - DS2406+R |
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类似说明 - DS2406+R |
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