Trigger Controller; Figure 34. Trigger Controller Block - Holtek HT32F52220 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F52220/HT32F52230

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 GPTM functions which are triggered by a trigger signal rising edge.
Trigger Controller Block = Edge Trigger Mux + Level Trigger Mux
Internal Trigger Input
Edge Trigger = Internal (ITIx) + Channel input (TIn)
Edge Trigger Mux
0
TI0S0ED
TI1S1ED
TI0BED
ITI0ED
ITI1ED
ITI2ED
Reserved
Level Trigger Source = Internal (ITIx) + Channel input (TIn) + Software UEV1G bit
Level Trigger Mux
SW Set
UEV1G Bit
TI0S0
TI1S1
0
ITI0
ITI1
ITI2
Reserved

Figure 34. Trigger Controller Block

Rev. 1.10
ITI0
ITI1
Edge Detection
ITI2
f
CLKIN
TRSEL[2:0]
000
001
010
STIED_S1
011
others
TRSEL[2:0]
000
001
010
STI_S1
011
others
181 of 366
ITI0ED
ITI1ED
ITI2ED
000
001
010
Reserved 011
STIED_S0
others
Reserved
TRSEL[3]
000
001
010
Reserved 011
others
Reserved
0
STIED
1
TRCED
STI_S0
0
STI
1
TRSEL[3]
November 09, 2018