Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
234
13. Real-time Timer (RTT)
13.1 Description
The Real-time Timer is built around a 32-bit counter used to count roll-over events of the programmable 16-bit
prescaler which enables counting elapsed seconds from a 32 kHz slow clock source. It generates a periodic
interrupt and/or triggers an alarm on a programmed value.
13.2 Embedded Characteristics
 32-bit Free-running Counter on prescaled slow clock
 16-bit Configurable Prescaler
 Interrupt on Alarm
13.3 Block Diagram
Figure 13-1. Real-time Timer
SLCK
RTPRES
RTTINC
ALMS
16-bit
Divider
32-bit
Counter
ALMV
=
CRTV
RTT_MR
RTT_VR
RTT_AR
RTT_SR
RTTINCIEN
RTT_MR
0
10
ALMIEN
rtt_int
RTT_MR
set
set
RTT_SR
read
RTT_SR
reset
reset
RTT_MR
reload
rtt_alarm
RTTRST
RTT_MR
RTTRST