Datasheet

1193
SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
Problem Fix/Workaround
Transmit STTDLY must be different from 0.
49.1.7.2 SSC: Unexpected delay on TD output
When SSC is configured with the following conditions:
 TCMR.STTDLY more than 0
 RCMR.START = Start on falling edge/Start on Rising edge/Start on any edge
 RFMR.FSOS = None (input)
 TCMR.START = Receive Start
Unexpected delay of 2 or 3 system clock cycles is added to TD output.
Problem Fix/Workaround
None
49.1.8 Touchscreen (TSADCC)
49.1.8.1 TSADCC: Pen detect accuracy is not good
Depending on LCD panels, the pen detect is noisy, leading to an unpredictable behavior.
Problem Fix/Workaround
An additional resistor solves the problem. Its value (between 100
kΩ and 250 kΩ) is to be tuned for the LCD panel.
49.1.9 USB High Speed Host Port (UHPHS)
49.1.9.1 UHPHS: Packet Loss Issue in the UTMI Transceivers
High-Speed USB Host may lose incoming packets when connected to an external USB Hub.
A high data transfer error rate has been observed on the High-Speed USB Host interface when connected to an
external USB Hub. The USB remains functional but the errors may require a reset of the USB interface to recover.
The Full-Speed USB Host operation is not affected by this problem.
Problem Fix/Workaround
A workaround consists of implementing a timeout on the USB communication using one of the timers in the device
and trigger a reset of the USB Host interface via software and restart the communication. The impact of the
workaround on the data rate is dependent on the error rate observed in the application but can be such that
streaming data at high rates becomes impractical.