Search found 2 matches
- Mon Nov 24, 2025 8:05 am
- Forum: ESP-IDF
- Topic: Is PLL 480 MHz or 320 MHz fixed per chip?
- Replies: 3
- Views: 1335
Re: Is PLL 480 MHz or 320 MHz fixed per chip?
Your APB drop happens because the 480 MHz PLL never activates. The ESP32 has two PLL modes, and you must explicitly switch to the 480 MHz one. If you only change the CPU dividers, the chip stays on the 320 MHz PLL.
You must enable the 480 MHz PLL before changing the CPU source. The ESP-IDF clock ...
- Mon Nov 24, 2025 6:23 am
- Forum: ESP-IDF
- Topic: Is PLL 480 MHz or 320 MHz fixed per chip?
- Replies: 3
- Views: 1335
Is PLL 480 MHz or 320 MHz fixed per chip?
I'm doing some bare metal dev work on the ESP32 and noticed something when playing around with the CPU frequency.
APB is supposed to be 80 MHz when the CPU clock source is PLL. Assuming APB_CLK is obtained from the PLL_CLK, the divider must be 4 if the PLL is 320 MHz and 6 if the PLL is 480 MHz ...
APB is supposed to be 80 MHz when the CPU clock source is PLL. Assuming APB_CLK is obtained from the PLL_CLK, the divider must be 4 if the PLL is 320 MHz and 6 if the PLL is 480 MHz ...