SPRUJF2A March 2026 – March 2026 AM13E23019
The PLL startup time depends on the PLL feedback loop input frequency fLOOPIN and if the PLL is starting after previously running (for example, exiting a low-power mode) or starting for the first time after device boot.
Table 3-9 lists an example of how the PLL startup times can be affected by the loop input frequency fLOOPIN. Note that fLOOPIN is determined by the SYSPLLREF and user-configured PDIV and QDIV.
| fLOOPIN | SYSPLL Startup Time (µs) | SYSPLL Startup Time on Exit From Low-Power Mode (µs) |
|---|---|---|
| 32MHz ≤ FREQ | 5 | 3 |
| 16MHz ≤ FREQ < 32MHz | 15 | 12 |
| 8MHz ≤ FREQ < 16MHz | 25 | 20 |
| 4MHz ≤ FREQ < 8MHz | 40 | 35 |