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Chapter 39 Programmable Pulse Generator
7.Q & A
7.7 What activation triggers are available and how are they selected?
• Trigger selection
• Activation triggers are broadly grouped into software triggers, internal triggers and external triggers.
• Software triggers work at all times.
• Internal and external trigger availability depends on each device specification.
An trigger is set using the trigger specification bits (GCN1.TSEL0[3:0]), (GCN1.TSEL1[3:0]),
(GCN1.TSEL2[3:0]), and (GCN1.TSEL3[3:0]).
Triggers are selectable for PPG0, PPG1, PPG2, and PPG3 independently.
Triggers are selectable for PPG4, PPG5, PPG6, and PPG7 independently.
Internal Trigger
PPG0 PPG1 PPG2 PPG3
Internal Trigger Specification Bit
TSEL0[3:0] TSEL1[3:0] TSEL2[3:0] TSEL3[3:0]
To select the EN0 bit of the GCN20 register Set “0000” Set “0000” Set “0000” Set “0000”
To select the EN1 bit of the GCN20 register Set “0001” Set “0001” Set “0001” Set “0001”
To select the EN2 bit of the GCN20 register Set “0010” Set “0010” Set “0010” Set “0010”
To select the EN3 bit of the GCN20 register Set “0011” Set “0011” Set “0011” Set “0011”
To select reload timer 0 Set “0100” Set “0100” Set “0100” Set “0100”
To select reload timer 1 Set “0101” Set “0101” Set “0101” Set “0101”
External Trigger
PPG0 PPG1 PPG2 PPG3
External Trigger Specification Bit
TSEL0[3:0] TSEL1[3:0] TSEL2[3:0] TSEL3[3:0]
To select the external trigger on GP14_0 Set “1000” Set “1000” Set “1000” Set “1000”
To select the external trigger on GP14_1 Set “1001” Set “1001” Set “1001” Set “1001”
To select the external trigger on GP14_2 Set “1010” Set “1010” Set “1010” Set “1010”
To select the external trigger on GP14_3 Set “1011” Set “1011” Set “1011” Set “1011”
Internal Trigger
PPG4 PPG5 PPG6 PPG7
Internal Trigger Specification Bit
TSEL0[3:0] TSEL1[3:0] TSEL2[3:0] TSEL3[3:0]
To select the EN0 bit of the GCN21 register Set “0000” Set “0000” Set “0000” Set “0000”
To select the EN1 bit of the GCN21 register Set “0001” Set “0001” Set “0001” Set “0001”
To select the EN2 bit of the GCN21 register Set “0010” Set “0010” Set “0010” Set “0010”
To select the EN3 bit of the GCN21 register Set “0011” Set “0011” Set “0011” Set “0011”
To select reload timer 2 Set “0100” Set “0100” Set “0100” Set “0100”
To select reload timer 3 Set “0101” Set “0101” Set “0101” Set “0101”
External Trigger
PPG4 PPG5 PPG6 PPG7
External Trigger Specification Bit
TSEL0[3:0] TSEL1[3:0] TSEL2[3:0] TSEL3[3:0]
To select the external trigger on GP14_4 Set “1000” Set “1000” Set “1000” Set “1000”
To select the external trigger on GP14_5 Set “1001” Set “1001” Set “1001” Set “1001”
To select the external trigger on GP14_6 Set “1010” Set “1010” Set “1010” Set “1010”
To select the external trigger on GP14_7 Set “1011” Set “1011” Set “1011” Set “1011”