SAM4L Datasheet, PDF (798/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
When using the TIOA/TIOB lines as inputs the user must make sure that no peripheral events
are generated on the line. Refer to Section 31. ”Peripheral Event Controller (PEVC)” on page
839 for details.
30.5.2
Power Management
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.
30.5.3 Clocks
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.
30.5.4 Interrupts
The TC interrupt request line is connected to the NVIC. Using the TC interrupt requires the NVIC
to be programmed first.
30.5.5
Peripheral Events
The TC peripheral events are connected via the Peripheral Event System. Refer to Section 31.
”Peripheral Event Controller (PEVC)” on page 839 for details.
30.5.6
Debug Operation
The Timer Counter clocks are frozen during debug operation, unless the OCD system keeps
peripherals running in debug operation.
30.6 Functional Description
30.6.1
TC Description
The three channels of the Timer Counter are independent and identical in operation. The regis-
ters for channel programming are listed in Figure 30-3 on page 813.
30.6.1.1
Channel I/O Signals
As described in Figure 30.3 on page 797, each Channel has the following I/O signals.
Table 30-2. Channel I/O Signals Description
Block/Channel
Signal Name
Description
XC0, XC1, XC2
External Clock Inputs
TIOA
Capture mode: Timer Counter Input
Waveform mode: Timer Counter Output
Channel Signal
TIOB
Capture mode: Timer Counter Input
Waveform mode: Timer Counter Input/Output
INT
Interrupt Signal Output
SYNC
Synchronization Input Signal
30.6.1.2
16-bit counter
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
42023C–SAM–02/2013
798