Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet

42023E–SAM–07/2013

When using the TIOA/TIOB lines as inputs the user must make sure that no peripheral events
are generated on the line. Refer to 

 for details.

If the CPU enters a sleep mode that disables clocks used by the TC, the TC will stop functioning
and resume operation after the system wakes up from sleep mode.

The clock for the TC bus interface (CLK_TC) is generated by the Power Manager. This clock is
disabled at reset, and can be enabled in the Power Manager. It is recommended to disable the
TC before disabling the clock, to avoid freezing the TC in an undefined state.

The TC interrupt request line is connected to the NVIC. Using the TC interrupt requires the NVIC
to be programmed first.

The TC peripheral events are connected via the Peripheral Event System. Refer to 

 for details.

The Timer Counter clocks are frozen during debug operation, unless the OCD system keeps
peripherals running in debug operation.

The three channels of the Timer Counter are independent and identical in operation. The regis-
ters for channel programming are listed in 

As described in 

, each Channel has the following I/O signals.

Each channel is organized around a 16-bit counter. The value of the counter is incremented at
each positive edge of the selected clock. When the counter has reached the value 0xFFFF and

Channel I/O Signals Description

Channel Signal

XC0, XC1, XC2

External Clock Inputs

TIOA

Capture mode: Timer Counter Input
Waveform mode: Timer Counter Output

TIOB

Capture mode: Timer Counter Input
Waveform mode: Timer Counter Input/Output

INT

Interrupt Signal Output

SYNC

Synchronization Input Signal