TM4C1290NCZAD Datasheet, PDF (964/1648 Pages) Texas Instruments – Tiva Microcontroller

General-Purpose Timers
Bit/Field
8
7
6
Name
TAILD
TASNAPS
TAWOT
Type
RW
RW
RW
Reset
0
0
Description
GPTM Timer A Interval Load Write
Value Description
0 Update the GPTMTAR and GPTMTAV registers with the value
in the GPTMTAILR register on the next cycle. Also update the
GPTMTAPS register with the value in the GPTMTAPR register
on the next cycle.
1 Update the GPTMTAR and GPTMTAV registers with the value
in the GPTMTAILR register on the next timeout. Also update
the GPTMTAPS register with the value in the GPTMTAPR
register on the next timeout.
Note the state of this bit has no effect when counting up.
The bit descriptions above apply if the timer is enabled and running. If
the timer is disabled (TAEN is clear) when this bit is set, GPTMTAR
GPTMTAV and GPTMTAPs, are updated when the timer is enabled. If
the timer is stalled (TASTALL is set), GPTMTAR and GPTMTAPS are
updated according to the configuration of this bit.
GPTM Timer A Snap-Shot Mode
Value Description
0 Snap-shot mode is disabled.
1 If Timer A is configured in the periodic mode, the actual
free-running, capture or snapshot value of Timer A is loaded at
the time-out event/capture or snapshot event into the GPTM
Timer A (GPTMTAR) register. If the timer prescaler is used,
the prescaler snapshot is loaded into the GPTM Timer A
(GPTMTAPR).
0
GPTM Timer A Wait-on-Trigger
Note:
If the application requires cyclical daisy-chaining, the TAWOT
bit in the GPTMTAMR register of Timer 0 can be set. In this
case, Timer 0 waits for a trigger from the last timer module in
the chain.
Value Description
0 Timer A begins counting as soon as it is enabled.
1 If Timer A is enabled (TAEN is set in the GPTMCTL register),
Timer A does not begin counting until it receives a trigger from
the timer in the previous position in the daisy chain, see Figure
13-8 on page 954. This function is valid for one-shot, periodic,
and PWM modes.
964
June 18, 2014
Texas Instruments-Production Data