Sanyo MBC-550 Series User Manual

USART 8251A8251 A is a combination device operating in the doublebuffer mode. Input to output form the RS-232C interfaceboard is performed by this USART.The USART is intialized to one start bit, eight databits, no parity, and one stop bit. It operates at atransmission rate of 1200 bits/sec (determined by timercounter 2) in the asynchronous mode.Send/receive clock8253 OUT2Output databuffet RS-232C28H Input databufferCommand2AH statusRx TxROY ROY8259 A IR2Markspace \ ar / °° x «x ■» nft:=e0^,ece:;;rLr_Lr~Ln_n_n_rlfi_n_n_jn_Oc Os Da Dj D? Oi DO07RX 1,SYM n mD5R pjj ft 01 ROY ROY•I' it transmit data Puller a empt i-------- C//n Id R* ROY pm]Conform to T« EMRTYpmT rl Htcixi (]«ti it m pari* t error Clear thittii mth £R corr*rr.arri. USARTOP««le nOt atlected‘f it n«*t data n marred Pelore CRU r Rewree data alterr*RT operationeadt•erred to data Poller, this P't d cleared Py £Rnot al'ected■1 is tranjYritn a>encr*o»rut system. T it no stop P i d detected elm da’a cPetecterstn.sort d cleared Py CRcommard. USAHT operetmn eni allectedConform (rj S YNOl T/BO pmJ T rl l^R p.n n l \ ff OGR pm .15-32

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