TISR
MAT_IT_FLAG
OVF_IT_FLAG
TCAR_IT_FLAG
TWER
MAT_WUP_ENA
OVF_WUP_ENA
TCAR_WUP_ENA
Interrupts
Sources
TIOCP_CFG
ENAWAKEUP
timer_wakeup
DMTimer 1ms
This wake-up request is effectively sent only if the field ENAWAKEUP of TIOCP_CFG enables the timer
wake-up capability. When the system is awaken, the Idle Request signal goes inactive and the wake-up
request signal is also de-asserted.
Figure 20-34. Wake-up Request Generation
20.2.3.7.1 Wake-up Line Release
When the host processor receives wake-up request issued by the timer peripheral, the interface clock is
re-activated: the host processor deactivates the PIOCPMIDLEREQ, the timer deactivates the
POROCPSIDLEACK signal and then the host can read the corresponding bit in TISR to find out which
interrupt source has trigged wake-up request. After acknowledging the wake-up request, the processor
resets the status bit and releases the interrupt line by writing a ‘1’ in the corresponding bit of the TISR
register.
20.2.3.8 Timer Counting Rate
The dmtimer’s counter is composed of a prescaler stage and a timer counter.
Ratio can be managed by accessing the ratio definition field of the control register (PTV and PRE of
TCLR).
The timer rate is defined by:
•
The value of the prescaler fields (PRE and PTV of TCLR register)
•
The value loaded into the Timer Load Register (TLDR).
Table 20-33. Prescaler Clock Ratios Value
PRE
PTV
Divisor (PS)
0
X
1
1
0
2
1
1
4
1
2
8
1
3
16
1
4
32
3596Timers
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated