User Manual
450
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
General Purpose Timer Units (GPT12)
Timers T2 and T4 in Capture Mode
Capture mode for an auxiliary timer Tx is selected by setting bitfield TxM in the respective register TxCON to
101
B
. In capture mode, the contents of the core timer T3 are latched into an auxiliary timer register in response
to a signal transition at the respective auxiliary timer’s external input pin TxIN. The capture trigger signal can
be a positive, a negative, or both a positive and a negative transition.
The two least significant bits of bitfield TxI select the active transition (see
). Bit 2 of TxI is irrelevant
for capture mode and must be cleared (TxI.2 = 0).
Note:
When programmed for capture mode, the respective auxiliary timer (T2 or T4) stops independently
of its run flag T2R or T4R.
Figure 98 GPT1 Auxiliary Timer in Capture Mode
Upon a trigger (selected transition) at the corresponding input pin TxIN the contents of the core timer are
loaded into the auxiliary timer register and the associated interrupt request flag TxIR will be set.
For capture mode operation, the respective timer input pin TxIN must be configured as input. To ensure that
a transition of the capture input signal applied to TxIN is recognized correctly, its level must be held high or
low for a minimum number of module clock cycles, detailed in
.
MCA05402
Toggle Latch
T3OUT
T3IRQ
Count
T3R
Core Timer T3
Operating
Mode
Control
BPS1
T3I
Up/Down
T3IN
f
GPT
Auxiliary
Timer Tx
TxI
Capture
TxIN
TxIRQ
x = 2, 4
y = 4, 2
to Ty
Edge
Select