UCD9090
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SLVSA30A –APRIL 2011–REVISED AUGUST 2011
There is an internal firmware watchdog timer. If it times out, the device resets so that if the firmware program is
corrupted, the device goes back to a known state. This is a normal device reset, so all of the GPIO pins are
open-drain and the FPWM pins are driven low while the device is in reset. Checks are also done on each
parameter that is passed, to make sure it falls within the acceptable range.
Error-correcting code (ECC) is used to improve data integrity and provide high-reliability storage of Data Flash
contents. ECC uses dedicated hardware to generate extra check bits for the user data as it is written into the
Flash memory. This adds an additional six bits to each 32-bit memory word stored into the Flash array. These
extra check bits, along with the hardware ECC algorithm, allow for any single-bit error to be detected and
corrected when the Data Flash is read.
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