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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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TNETV2501INPGF bảng dữ liệu(PDF) 104 Page - Texas Instruments |
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TNETV2501INPGF bảng dữ liệu(HTML) 104 Page - Texas Instruments |
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104 / 197 page  Functional Overview 104 December 2002 − Revised November 2008 SPRS206K 3.12 External Bus Control Register The External Bus Control Register is used to disable/enable the bus pullups, pulldowns, and bus holders of the 5501 pins. Table 3−45 lists which 5501 pins have pullups, pulldowns, and bus holders, and which bit on the XBCR enables/disables that feature. Please note that for pins with dual functionality (e.g., HC0, HC1, C0, etc.), the bus holder, pullup, and pulldown feature of each pin can be enabled or disabled regardless of the function of the pin at the time. Table 3−45. Pins With Pullups, Pulldowns, and Bus Holders XBCR CONTROL BIT PIN FEATURE TCK Pullup TEST TDI Pullup TEST TMS Pullup TRST Pulldown EMU EMU1/OFF Pullup EMU EMU0 Pullup WDT NMI/WDTOUT Pullup HC0 Pullup HC1 Pulldown HCNTL0 Pullup HCNTL1 Pullup HC HCS Pullup HC HR/W Pullup HDS1 Pullup HDS2 Pullup HRDY Pullup HINT Pullup HD HD[7:0] Bus Holder C0 Bus Holder C1 Bus Holder C2 Bus Holder C3 Pullup C4 Bus Holder C5 Bus Holder C6 Bus Holder PC C7 Bus Holder PC C8 Bus Holder C9 Bus Holder C10 Bus Holder C11 Bus Holder C12 Bus Holder C13 Bus Holder C14 Pullup C15 Bus Holder PD D[31:0] Bus Holder PA A[21:2] Bus Holder |
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