The main features of the LPO are:
- Supplies a clock at extremely low power for power-saving modes. This is connected as clock source # 4 of the Global Clock Module.
- Supplies a high-frequency clock for nontiming-critical systems. This is connected as clock source # 5 of the Global Clock Module.
- Provides a comparison clock for the crystal oscillator failure detection circuit.
Figure 6-5 LPO Block Diagram
Figure 6-5 shows a block diagram of the internal reference oscillator. This is an LPO and provides two clock sources: one nominally 80 kHz and one nominally 10 MHz.