Epson TM-U950 Technical Manual page 82

CONFIDENTIAL
LED drive as well as switch and photosensor status detection is performed by the CPU. For
signal I/O, the CPU ports and the expansion ports on the gate array are used.
DIP switch circuit
Parallel-to-serial conversion of the settings of DIP switch banks 1 and 2 is performed by the
conversion IC (U10, U17), and the result is input to the gate array port (PB0, PB1). DIP switch
selection is made by the SWSL signal (PB3). The SWCL signal (PB2) is used as a clock signal and
the switch settings are read one bit at a time.
Rev. A
Figure 2-46. Operation Panel and Cover Open Sensor Circuits
Figure 2-47. DIP Switch Circuit for the TM-U950
TM-U950/U950P Technical Manual
Mechanism Configuration and Operating Principles 2-37