Texas Instrument TMS320F28062FP Microprocessor Source Code Reading will help engineer to make dsp microcontroller tms320f28062 software cloning after attacking mcu tms320f28062 flash memory protective fuse bit;
- IDLE instruction is executed to put the device into HALT mode.
- The PLL block responds to the HALT signal. SYSCLKOUT is held for the number of cycles indicated below before oscillator is turned off and the CLKIN to the core is stopped:
- 16 cycles, when DIVSEL = 00 or 01
- 32 cycles, when DIVSEL = 10
- 64 cycles, when DIVSEL = 11
This delay enables the CPU pipeline and any other pending operations to flush properly.
Clocks to the peripherals are turned off and the PLL is shut down. If a quartz crystal or ceramic resonator is used as the clock source, the internal oscillator is shut down as well. The device is now in HALT mode and consumes absolute minimum power.
It is possible to keep the zero-pin internal oscillators (INTOSC1 and INTOSC2) and the watchdog alive in HALT mode. This is done by writing to the appropriate bits in the CLKCTL register. After the IDLE instruction is executed, a delay of five OSCCLK cycles (minimum) is needed before the wake-up signal could be asserted which can be used for extract tms320f28023 microcontroller flash code in the format of binary.
When the GPIOn pin (used to bring the device out of HALT) is driven low, the oscillator is turned on and the oscillator wake-up sequence is initiated. The GPIO pin should be driven high only after the oscillator has stabilized.
This enables the provision of a clean clock signal during the PLL lock sequence. Because the falling edge of the GPIO pin asynchronously begins the wake-up procedure, care should be taken to maintain a low-noise environment before entering and during HALT mode which will help to unlock microprocessor tms320f28021 flash memory.
