AT91SAM9G46B-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT91SAM9G46B-CU

SMART ARM-based Embedded MPU

Atmel Corporation 

Problem Fix/Workaround

Transmit STTDLY must be different from 0.

52.1.7.2 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

52.1.8 Touchscreen (TSADCC)

52.1.8.1 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.

52.1.9 USB High Speed Host Port (UHPHS) and Device Port (UDPHS)

52.1.9.1 UHPHS/UDPHS: USB Does Not Start after Power-up

The USB may not start properly at first use after power-up.

Booting out of the internal ROM fixes this issue because the workaround below is applied in the ROM Code.

Problem Fix/Workaround

There are two possible workarounds:

1. Apply a hardware reset (NRST) after power-up

or:

2. Activate the PLLUTMI twice, following the procedure below:

a. Start The UTMI PLL an wait for the PLL lock bit

b. Disable the UTMI PLL and wait 10 µ seconds minimum

c. Restart the UTMI PLL and wait for the PLL Lock bit

SAM9G46 Series [DATASHEET]

Atmel-11028G-ATARM-SAM9G46-Datasheet_08-Dec-15

1249

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