Cypress FM4 Series - Page 142

CHAPTER 3: Clock Supervisor
142 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
Anomalous Frequency Detection
Figure 2-2 shows the block diagram of the anomalous frequency detection.
Figure 2-2 Anomalous Frequency Detection Block Diagram
The anomalous frequency detection consists of the following three types of blocks.
 Control circuit/register and window registers
− This block includes a circuit controlling the anomalous frequency detection.
− Also includes setup registers enabling/disabling the anomalous frequency detection.
− Also includes window registers defining the frequency range for measurements.
 Frequency counter
A counter based on the main clock.
 Divider/edge detection
− This block divides the high-speed CR.
− Also detects rising edges of the divided clock of high-speed CR.
Frequency
counter
Control circuit /
register and
window registers
Edge
detection
divider
FCS_RESET
Main Clock
High-speed CR
FCS_INT