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AT89C5122D-RDRUM 数据表(PDF) 57 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 57 Page - ATMEL Corporation |
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57 / 208 page  57 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 Figure 25. Input with Pull-up Input with Weak Pull-down Configuration The input with pull-down (input WPD) configuration is shown in Figure 26 Figure 26. Input with Pull-down Low Speed Output Configuration The low speed output with low speed tFALL and tRISE can drive keyboard. The current limitation of the LED2CTRL block requires a polarisation current of about 250 μA. This block is automatically disabled in power-down mode. The low speed output configuration (KB_OUT) is shown in Figure 27. Figure 27. Low-speed Output LED Source Current The LED configuration is shown in Figure 28. Input Pin Data Weak P Medium P Stuck to 0 if Medium Stuck to 0 if Weak Input Pin Data Weak N 1 Pin P PWEAKCTRL Port latch Data N N NMOS PCON.1 Weak LED2CTRL |
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