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The TMS320F28043 has an on-chip, PLL-based clock module. This module provides all the necessary clocking signals for the device and it is important for Copy TMS320F28043 MCU Flash Program, as well as control for low-power mode entry. The only external component necessary for this module is an external fundamental crystal, or oscillator.
The PLL-based clock module provides two basic modes of operation: oscillator mode and clock-in mode.
This mode allows the use of a 4-, 6-, or 8-MHz external reference crystal to provide the time base to the device. The internal oscillator circuitry is initialized by software to select the desired CPUCLK frequency, which can be the input clock frequency for the purpose of Microcontroller Unlocking, the input clock frequency divided by 2 (default), or a clock frequency determined by the PLL.

Copy TMS320F28043 MCU Flash Program

This mode allows the internal crystal oscillator circuitry to be bypassed. The device clocks are generated from an external clock source input on the XTAL1/CLKIN pin to Read MCU. The device can be configured by software to operate on the input clock frequency, the input clock frequency divided by 2, or a clock frequency determined by the PLL.
The ’x240 runs on two clock frequencies: the CPU clock (CPUCLK) frequency, and the system clock (SYSCLK) frequency. The CPU, memories, external memory interface, and event manager run at the CPUCLK frequency. All other peripherals run at the SYSCLK frequency similar to the process of Removing MC68HC11K1 MCU Protection.

The CPUCLK runs at 2x or 4x the frequency of the SYSCLK; for example, for 2x, CPUCLK = 20 MHz and SYSCLK = 10 MHz. There is also a clock for the watchdog timer, WDCLK. This clock has a nominal frequency of 16384 Hz (214 Hz) when XTAL1/CLKIN is a power of two or a sum of two powers of two; for example, 4194304 Hz (222 Hz), 6291456 (222 + 221 Hz), or 8388608 Hz (223 Hz).

The clock module includes three external pins:
1. XTAL1/CLKIN clock source/crystal input
2. XTAL2 output to crystal
3. OSCBYP oscillator bypass

For the external pins, if OSCBYP  VIH, then the oscillator is enabled and if OSCBYP  VIL, then the oscillator is bypassed and the device is in clock-in mode when Clone MCU ATmega1284P Heximal. In clock-in mode, an external TTL clock must be applied to the XTAL1/CLKIN pin. The XTAL2 pin can be left unconnected.