40496501TH Draft Version 292.1.13 Operation PanelThe clock synchronization OPCLK of NHDC LSI is used to input the switch data and output the LEDdata and LCD data through the operation panel control LSI (IC1: BU6152S).A 2-byte (15 bits + 1 even parity bit) command (OPDATAOUT-P) is transmitted to the LSI(BU6152S) in synchronization with the OPSCLK-N signal. The LSI decodes this command andwhen it is found to be legal, returns a 2-byte command response back to the NHDC LSI whichincludes data on Switch information, LED status, LCD status receive command ACK/NAK and 1odd parity bit.Any transmission errors found cause the command to be reissued after the transmission of theOPSQCR-N signal.NHDC LSI BU6152SOPDATAOUT-POPSCLK-NOPSQCR-NOPDATAIN-P565958SDOSCKNSCSNSDICommandand DatalatchLED driverSwitchcontroller+5V57Figure 2.17
