SAM4L Datasheet, PDF (842/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
Table 31-2.
Phase
5
6
7
8
9
SleepWalking™ on Peripheral Events
Operation
incoming Event j propagates to Channel i:
• CLK_USER i request to PM
• TRIG i forwarded to User i
CLK_USER i wakes up
User i handles the incoming Peripheral Event and signals it to PEVC
depending on the Peripheral’s operation, a CPU wake request occurs in case of
Interrupt processing
alternatively, the Peripheral may simply go back to sleep, in which case PM will
silently shut off CLK_USER i and CLK_PEVC
Figure 31-3. SleepWalking™ on Peripheral Events
Power Manager
Wake Clock Sources
3
CLK_PEVC
Wake CPU
CLK_USER i
8
IRQ USER i
6
2
1
Generator
EVS
j
EVT j
j
PEVC
4
5
Channel
i
TRIG i ₅
7 _{RDY i}
CLK_USER i
User
i
31.5.3 Clocks
42023C–SAM–02/2013
The PEVC has two clocks connected: one Peripheral Bus clock (CLK_PEVC) and the system
RC oscillator clock (CLK_RCSYS). These clocks are generated by the Power Manager.
CLK_PEVC is required for event propagation and Peripheral Bus operations.
CLK_RCSYS is used for glitch filtering in Event Shapers. It is required for event propagation in
case glitch filtering is turned on for a given generator.
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