%2.1.06 Operation Panel2.1.06 Operation PanelThe Serial I/O Port (Ports 20 - 23) of the MPU reads the operation panel switch data from the operationpanel control LSI (Location IC1: BUS148S).A two byte (15 bits +1 parity bit (even parity)) command (OPTXD) is transmitted from the MPU to theoperation panel LSI in synchronization with the OPCLK signal. Once the LSI decodes the command, thecommand must pass a command code check and have no parity errors. Then, the specified I/O controlwill return the two byte command response to the MPU.ML520/521 ( 96-02-04 )
