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TMS320F28375SPZPQR 数据表(PDF) 39 Page - Texas Instruments |
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TMS320F28375SPZPQR 数据表(HTML) 39 Page - Texas Instruments |
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39 / 225 page  (2) High-Speed SPI-enabled GPIO mux option. This pin mux option is required when using the SPI in High-Speed Mode (HS_MODE = 1 in SPICCR). This mux option is still available when not using the SPI in High-Speed Mode (HS_MODE = 0 in SPICCR). (3) This pin has output impedance that can be as low as 22 Ω. This output could have fast edges and ringing depending on the system PCB characteristics. If this is a concern, the user should take precautions such as adding a 39Ω (10% tolerance) series termination resistor or implement some other termination scheme. It is also recommended that a system-level signal integrity analysis be performed with the provided IBIS models. The termination is not required if this pin is used for input function. 6.3 Pins With Internal Pullup and Pulldown Some pins on the device have internal pullups or pulldowns. Table 6-1 lists the pull direction and when it is active. The pullups on GPIO pins are disabled by default and can be enabled through software. In order to avoid any floating unbonded inputs, the Boot ROM will enable internal pullups on GPIO pins that are not bonded out in a particular package. Other pins noted in Table 6-1 with pullups and pulldowns are always on and cannot be disabled. Table 6-1. Pins With Internal Pullup and Pulldown PIN RESET ( XRS = 0) DEVICE BOOT APPLICATION SOFTWARE GPIOx Pullup disabled Pullup disabled(1) Pullup enable is application- defined TRST Pulldown active TCK Pullup active TMS Pullup active TDI Pullup active XRS Pullup active VREGENZ Pulldown active ERRORSTS Pulldown active Other pins No pullup or pulldown present (1) Pins not bonded out in a given package will have the internal pullups enabled by the Boot ROM. www.ti.com TMS320F28379S, TMS320F28378S, TMS320F28377S, TMS320F28377S-Q1 TMS320F28376S, TMS320F28375S, TMS320F28375S-Q1, TMS320F28374S SPRS881J – AUGUST 2014 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 39 Product Folder Links: TMS320F28379S TMS320F28378S TMS320F28377S TMS320F28377S-Q1 TMS320F28376S TMS320F28375S TMS320F28375S-Q1 TMS320F28374S |
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