Trigger Controller; Figure 68. Trigger Control Block - Holtek HT32F50231 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F50231/HT32F50241

Trigger Controller

The trigger controller is used to select the trigger source and setup the trigger level or edge trigger
condition. For the internal trigger input, it can be selected by the Trigger Selection bits TRSEL in
the TRCFR register. For all the trigger sources except the UEVG bit software trigger, the internal
edge detection circuitry will generate a clock pulse at each trigger signal rising edge to stimulate
some PWM functions which are triggered by a trigger signal rising edge.
Trigger Controller Block = Edge Trigger Mux + Level Trigger Mux
Internal Trigger Input
Edge Trigger Source = Internal (ITIx)
Level Trigger Source = Internal (ITIx) + Software UEVG bit
S/W Set UEVG Bit

Figure 68. Trigger Control Block

Rev. 1.00
ITI0
ITI1
ITI2
Edge Detection
f
CLKIN
Edge Trigger Mux
Reserved
ITI0ED
ITI1ED
ITI2ED
Reserved
Level Trigger Mux
ITI0
ITI1
ITI2
Reserved
252 of 486
ITI0ED
ITI1ED
ITI2ED
0000
1001
1010
1011
others
TRSEL[3:0]
0000
1001
1010
1011
others
TRSEL[3:0]
STIED
STI
July 31, 2018