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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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9202 датащи(PDF) 134 Page - STMicroelectronics |
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9202 датащи(HTML) 134 Page - STMicroelectronics |
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134 / 175 page  UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV 134/175 External Chip Select The CPLD also provides two External Chip Select (ECS1-ECS2) outputs on Port D pins that can be used to select external devices. Each External Chip Select (ECS1-ECS2) consists of one product term that can be configured active High or Low. The output enable of the pin is controlled by either the output enable product term or the Direction Register. (See Figure 68.) Figure 68. Port D External Chip Select Signals POLARITY BIT PD2 PIN PT2 ECS2 DIRECTION REGISTER ENABLE (.OE) POLARITY BIT PD1 PIN PT1 ECS1 ENABLE (.OE) DIRECTION REGISTER AI06607 |
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