replace M41T56M6 by DS1307ZN+

remove keystone103 for RTC battery and replace it by 2 pin
change MCP2551 soic8 to DIP8
Ground plane under MCU - RPM traces - power capacitor for MCU

The ground plane under the Freescale MCU should look like the suggested
PCB design in the Freescale 9S12XDP512 datasheet