Timer0 and Timer1 External Clock Requirements

Table 1.

Standard Operating Conditions (unless otherwise stated)

Operating Temperature: -40°C≤TA≤+125°C

Param No. Sym. Characteristic Min. Typ. † Max. Units Conditions
40* TT0H T0CKI High Pulse Width No Prescaler 0.5TCY+20 ns  
With Prescaler 10 ns  
41* TT0L T0CKI Low Pulse Width No Prescaler 0.5TCY+20 ns  
With Prescaler 10 ns  
42* TT0P T0CKI Period Greater of: 20 or (TCY+40)/N ns N = Prescale value
45* TT1H T1CKI High Time Synchronous, No Prescaler 0.5TCY+20 ns  
  Synchronous, with Prescaler 15 ns  
  Asynchronous 30 ns  
46* TT1L T1CKI Low Time Synchronous, No Prescaler 0.5TCY+20 ns  
  Synchronous, with Prescaler 15 ns  
  Asynchronous 30 ns  
47* TT1P T1CKI Input Period Synchronous Greater of: 30 or (TCY+40)/N ns N = Prescale value
Asynchronous 60 ns  
49* TCKEZTMR1 Delay from External Clock Edge to Timer Increment 2 TOSC 7 TOSC Timers in Sync mode

* These parameters are characterized but not tested.

† Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.

Figure 1. Timer0 and Timing1 External Clock Timings