Модуль ввода-вывода МПС. Совмещенная карта. Адресный селектор. Порты ввода и вывода. Одноразрядный порт, страница 3

                                  7                     7                        +5B 

                                                                                                        STB

                                STB                                        CS                     

                                 OE                                                  1               OE

 

                                                                            IOR

На  STB=1, в триггеры постоянно поступают данные , но на выходы не проходят пока IOR=0, CS=0.

                                                                       В).                                                ШД   Внешнее устройство                                                                                                                                                                                                                                                        

                                                                                         DI     RG       DO                  само вырабатывает                                                   

CS                                                                                      0                    0                   строб и защелкивает.                                           

                                                                                           1                    1                    На ШД данные появляются                               

ОТ ВУ                                                     когда МП считывает данные                                                   

IOR                                                                                                                                 вырабатывает строб.                                                            

                                                                                           7                    7                                    

                                                                                                                                                                                      

                                                                                        STB                                                                                                          

                                                                              CS                                                                                                                

          OE                                                                       1             OE                                                                                  

 

IOR

Порт вывода.                                                             

         ШД                                                                    K555TM2        K555ЛП8 

                  DI     RG       DO                                                                                   ШД                                               

                   0                    0                        ОТ ВУ                                                                        

                   1                    1                                      D                         1                                                        

                                                     К ВУ                                              OE                 Одноразрядный                                                               порт                   

                   7                    7                                      C                                        

 CS