DSP Microcontroller TMS320F28075 Flash Binary Reading needs to unlock mcu tms320f28075 security fuse bit by focus ion beam and then duplicate embedded firmware from program flash memory of processor’s tms320f28075;
See Table 3-1 for details. Inputs are not 5-V tolerant. All GPIO pins are I/O/Z and have an internal pullup (PU), which can be selectively enabled or disabled on a per-pin basis. This feature only applies to the GPIO pins. The pullups on the PWM pins are not enabled at reset. The pullups on other GPIO pins are enabled upon reset. The AIO pins do not have an internal pullup.
When the on-chip voltage regulator (VREG) is used, the GPIO19, GPIO26–27, and GPIO34–38 pins could glitch during power up. This potential glitch will finish before the boot mode pins are read and will not affect boot behavior. If glitching is unacceptable in an application, 1.8 V could be supplied externally.
Alternatively, adding a current-limiting resistor (for example, 470 Ω) in series with these pins and any external driver could be considered to limit the potential for degradation to the pin and/or external circuitry only after firmware inside tms320f2806 flash memory has been extracted. There is no power- sequencing requirement when using an external 1.8-V supply.
However, if the 3.3-V transistors in the level-shifting output buffers of the I/O pins are powered before the 1.8-V transistors, it is possible for the output buffers to turn on, causing a glitch to occur on the pin during power up. To avoid this behavior, power the VDD pins before or simultaneously with the VDDIO pins, ensuring that the VDD pins have reached 0.7 V before the VDDIO pins reach 0.7V.
