Microchip Technology Inc

Hardware Limit Timer (HLT)

The Hardware Limit Timer (HLT) provides a timed hardware limit to be used in conjunction with asynchronous analog feedback applications, or to detect missed periodic events.


  • Hardware monitoring for missed periodic events and fault detection (stalls, stops, etc.)
  • Period timer with external reset input
  • Flexible design
    • Selectable start of event trigger
    • Multiple modes
    • Seven available clock sources
  • Resolution of ¼ instruction cycle
  • Useable as a general purpose 8-bit timer/counter with external reset capabilities


  • Reduces code complexity
    • No code for detection set-up
    • No code to manage timer
  • Core independent operation
  • Operation while in low power SLEEP
Hardware Limit Timer (HLT_)
Tabs / HLT


Title Date Published Size D/L
TB3122 - Hardware Limit Timer on PIC Microcontrollers 06/23/14 917 KB PDF
TB3108 - TRIAC Dimmable LED Driver Using PIC12HV752 06/23/14 917 KB PDF

8-Bit Video Channel