C/XT/AT are trademarks of International Business Machines Corp. This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. (S) MOTOROLA MOTOROLA INC., 1991 (Replaces MCS16C451/D) |CONTENTS 1.0 ABSOLUTE MAXIMUM RATINGS ......0....0. 0. cece ccc eee nett e net n ees 3 2.0 DCCHARACTERISTICS 2.0.0... ccc cece eee teen nent tee nee nent eeeees 4 3.0 ACCHARACTERISTICS ........ 00. nett t ete t teenies 5 4.0 PINDESCRIPTIONS 2.0... 0... cece een nent nee tnt nents 10 5.0 FUNCTIONAL DESCRIPTION 2.0.0.0... 0. ccc eect e tne e nent e ees 11 5.1 Application Circuit 2... een t netted bennett need 12 6.0 SERIAL PORT INTERFACE .............0 00.02 c cece cence nett nn ete nett ren ees 15 6.1. Transmitter Holding Register and Receiving Buffer Register ........... 0c. cece eee eee ee 16 6.2 Line Control Register ......... eee entree ented nent tetas 16 6.3 Line Status Register .... 0.6... een tent n ent e ete eee 17 6.4 Mode