Datasheet

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

962

Figure 39-3. Clock Selection

39.6.4 Clock Control

The clock of each counter can be controlled in two different ways: it can be enabled/disabled and started/stopped.

See Figure 39-4.

• The clock can be enabled or disabled by the user with the CLKEN and the CLKDIS commands in the TC

Channel Control Register (TC_CCR). In Capture Mode it can be disabled by an RB load event if LDBDIS is set

to 1 in the TC_CMR. In Waveform Mode, it can be disabled by an RC Compare event if CPCDIS is set to 1 in

TC_CMR. When disabled, the start or the stop actions have no effect: only a CLKEN command in the

TC_CCR can re-enable the clock. When the clock is enabled, the CLK

STA bit is set in the TC_SR.

• The clock can also be started or stopped: a trigger (software, synchro, external or compare) always starts the

clock. The clock can be stopped by an RB load event in Capture Mode (LDBSTOP = 1 in TC_CMR) or a RC

compare event in Waveform Mode (CPCSTOP = 1 in TC_CMR). The start and the stop commands have effect

only if the clock is enabled.

TIMER_CLOCK1

TIMER_CLOCK2

TIMER_CLOCK3

TIMER_CLOCK4

TIMER_CLOCK5

XC0

XC1

XC2

TCCLKS

CLKI

Synchronous

Edge Detection

BURST

Peripheral Clock

Selected

Clock