  This paper presents the proposed PMT readout and triggering system that will
be used in the MicroBooNE LArTPC experiment. The triggering scheme has been
designed to study beam neutrino events as well as fully characterize cosmic
rays. In addition, exploration of important physics applications including
"late" scintillation light in argon and Michel electrons from muon decay will
be possible. Various types of triggers and how they will be implemented in the
combined PMT+TPC readout electronics system will be discussed.
