使用8位的并行从端口

PIC16C64/74microcontrollersfromMicrochipTechnol-

ogyInc.canbeinterfacedwitheaseintoa

multi-microprocessorenvironmentusingitsbuilt-inPar-

allelSlavePort(PSP).Withtheirveryhighoperating

speeds(cycletimesaslowas200nswithaclockrate

of20MHz),andanarrayofon-chipperipherals,these

microcontrollersmakeidealsmartinterfacestothereal

world.MUsingthe8-BitParallelSlavePortAN579Theportpinsareconnectedtotwo8-bitlatches,oneforAuthor:ScottFinkdataoutput(fromthePIC16CXXX)andonefordataMicrochipTechnologyInc.input.ThePIC16CXXXsendsdatabywritingtotheoutputlatch,andreceivesdatabyreadingtheinputINTRODUCTIONlatch(notethattheinputandoutputlatchesareatthe