EPSON                 SPECIFCATIONS                            PAGE 17

III-C. Terminal Descriptions

     Terminal   I/O                   Function

       VDD       I    Power Supply (+5 V +-5 %)

       VSS       I    Power Supply ( 0 V)

      _____           RESET Signal Input
      RESET      I
                      Active-Low input for initializtion
                      (When RESET signal is supplied, the
                       controller LSI is reset to the
                       following status.)
                      DISPLAY: off, CURSOR: off,
                      CURSOR FONT: off,
                      UNDERLINE CURSOR: blinking off
                      CURSOR DIRECTION: increment
                      DISPLAY SUPRESS : off

                      For RESET signal in detail, refer to
                      "Reset Signal (P. 10)".

                      (Note) This terminal has a built-in
                      pull-up resistor (= 500 kohm).


      A0         I   Selection of Character Code Input/
                     Instruction Code Input
                       A0 = "1": Character Code Input
                       A0 = "0": Instruction Code Input

     ENB        I   Clock Input

                     External system clock input
                     For clock signal in detail, refer
                     "Clock Signal (P. 10)".

     __              Busy Flag Read Signal Input
     RD         I      __
                       RD = active "0"
                     When RD is low, master processor can
                     read status of Busy Flag register.

     __              Data Write Signal Input
     WR         I      __
                       WR = active "0"
                    When WR is low, master processor can
                    write Character Code or Instruction
                    Code to the module.

   D0 - D7      I   Data Input
               I/O
               (D7)   MSB = "D7"
                      LSB = "D0"
                    D7 is a I/O terminal, and outputs Busy
                    signal when executing Busy Flag
                    instruction.
                      D7 = "1": Busy
                      D7 = "0": Not Busy