1.2.23.2 ACM Clock

This is called Analog Configuration MUX frequency. This block resides in the AB library macro. Its purpose is to house the registers for Analog I/O configuration and RTC configuration.

The ACM port interface has a max frequency of 10 Mhz. This is a silicon requirement and must be adhered to whenever using the ACM port interface.

If the ACM is already configured (during initialization) and the interface is not used during normal operation, it is safe to connect this clock to a frequency greater than 10 Mhz, however the ACM is inoperable in this state. The AB library macro reports warning messages during simulation about the frequency being exceeded but they can be safely ignored at this stage.