LOGICAL WAVEFORM GENERATOR

摘要

PURPOSE:To eliminate the need for the clock for control over pin multiplexing by converting data for controlling an output waveform into a form suitable for the pin multiplexing and generating the waveform of either channel. CONSTITUTION:A converting circuit 3011 generates four bit data 3141-3171 to be inputted to an odd-channel side shift register 3031 in pin multiplex mode. Further, an odd-channel side shift register control circuit 3021 generate a clock 3111 and an operation selection signal 3121 with three clocks 3081-3101 and control data 3201 consisting of several bits. Then when a control signal 319 becomes logic 1, a gate 304 is opened and clock signals 3111 and 313 (3112) generated by odd- and even-channel side shift register control circuits 3021 and 3022 are supplied to the shift register 3031 through an OR gate 305.