i.Mx 8M Nano - Cortex M7 Core frequency Selection

[sergiospader]

Good Morning,

As I understand Cortex M7 Core frequency can be configures to 600Mhz or 750Mhz.

Looking at datasheet, the only reference for this configuration is the Voltage Value (0.85 for 600Mhz and 0.95 for 750Mhz)

At my case, I will use 0.85V for 600Mhz.

My question is, how do I configure the internal multipliers of M7 to run at this frequency ? Or I just need to power it with 0.85V and the frequency is consequence.

Thanks

Sergio Spader

[igorpadykov · Accepted solution]

Hi Sergio

for configuring M7 frequency one can look at Table 5-1. Clock Root Table (ARM_M7_CLK_ROOT),

Figure 5-2. CCM input clock sources, sect.5.1.8.25 M7 Alternate PLL General Function Control Register

i.MX 8M Nano Applications Processor Reference Manual

In general it is not changed automatically with voltage change.

Best regards
igor