SAM4S SAP-630 SERIES 6-1
6 Troubleshooting
6-1 System power-up sequence
The following lists the chain of events that occur when you turn on the POS. You can follow this list as one
means of determining if the POS is operating correctly.
When the power switch is turned on, these events occur:
6-1-1 Main B’D power-up sequence
All devices (CPU, Memory, Controller…etc,) are reset.
The OS & application program is copy from eMMC to DDR3 (2GB).
It takes about 10 sec.
Now, Application program is run on DDR3 and TFT-LCD is displayed.
All devices (micom, Memory…etc,) are reset.
The power 5V LED are light on IO B’D. (LED1)
And then, IO MICOM(U17) is waiting for communication with main CPU.
6-1-3 LCD B’D power-up sequence
The micom (ATMEGA8) is reset.
The power(5V) LED are light on LCD B’D
The Rear 2Line LCD are displayed
And then, LED B’D is waiting for communication with main B’D.
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