Sleep Mode Request And Acknowledge - Texas Instruments OMAP5912 Reference Manual

4.8

Sleep Mode Request and Acknowledge

Figure 8. Wake-Up Request Generation
MAT_WUP_ENA
Interrupts
sources
MAT_IT_FLAG OVF_IT_FLAG
SPRU759B
Upon a sleep mode request issued by the host processor, the timer module
goes into sleep mode depending on the IDLEMODE field of the system
configuration register (see TIOCP_CFG).
If the IDLEMODE field sets no-idle mode, the timer does not go into sleep
mode and the idle acknowledge signal is never asserted.
If the IDLEMODE field sets force-idle mode, the timer goes into sleep mode
independently of the internal module state, and the idle acknowledge signal
is unconditionally asserted.
If the IDLEMODE field sets smart-idle mode, the timer module evaluates its
internal capability to have the interface clock switched off. Once there is no
more internal activity (no pending interrupt sources: match, overflow, or timer
capture events), the idle acknowledge signal is asserted and the timer enters
into sleep mode, ready to issue a wake-up request. This wake-up request is
sent only if the field ENAWAKEUP of TIOCP_CFG enables the timer wake-up
capability.
Figure 8 shows the wake-up request generation.
TWER
OVF_WUP_ENA
TCAR_IT_FLAG
TISR
TCAR_WUP_ENA
Dual-Mode Timer
TIOCP_CFG
ENAWAKEUP
Timer wakeup
Timers 37