4_MHz_NAND_GATE_OSCILLATOR_SYNCHRO_NIZES_TW0_MPUs_

Published:2009/7/5 22:50:00 Author:May | From:SeekIC

Low-cost NAND-gate sections A and B form low-cost oscillator for driving two Motorola MC6802 microprocessors.NAND gates C and D function as phase-locked loop, with D ensuring that phases of enable outputs are 180° apart. Small drifts in oscillator frequency do not affect synchronization. Circuit allows each MPU to operate during half-cycle that other MPU has disabled, to provide additional computing power of two microprocessors while maintaining system costs of onedata bus.-J. Farrell, Synchronizing Two Motorola MC6802s on One Bus, Motorola, Phoenix, AZ, 1978, AN-783.



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