Maxim Integrated 71M6513H Power Meter IC Family Software - Manual (Page 48)

71M651x Software User’s Guide
function in the main loop of the background task (see Figure 5-7). Eight software timers can be simultaneously
running.
There is an issue with this type of timer processing: The CE_update() routine takes about 400ms,
and when it is executing, it is not checking the tick_tock variable, resulting in the software timers
running slow.
The process_timers() routine was fixed in firmware revision 3.05, where timer0 increments a
count, and the process_timers() routine processes the count, not just the presence of the timer
tick.
timer1 is used for delay functions, e.g. for EEPROM or RTC access control. Timer 1 is enabled and starts functioning
by calling the “Add_Delay_Func()” function as defined in the timer.c module.
TH0 load
TL0 load
tick_tock = TRUE
JUMP
to Init
timer0_isr
reload Timer/counter high byte
reload Timer/counter low byte
Set softwware flag
TR1 = 0
ET1 = 0
(*delay_func) ()
JUMP
to Init
timer1_isr
Execute a timer function
Stop Timer 1
Disable Timer 1
Figure 5-6: Timer ISRs
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