Main CPU Monitor - P1633

Main CPU monitor - P1633
At CPU initialisation this monitor checks whether the ROM check sum for the sub CPU monitor is ok. If the checksums do not agree for more than a calibratable time, a failure judgement is made. The same check is performed for the RAM memory area for sub CPU monitor. If the checksums do not agree for more than a calibratable time, a failure judgement is made. During ignition on, the main CPU mirror checks certain sequence, RAM and ROM calculations with the sub CPU. If the mirror checks do not agree for more than a calibratable time, a failure judgement is made.