AT91SAM9261-CJ-999 Atmel, AT91SAM9261-CJ-999 Datasheet - Page 706

• Manufacturer Part Number: AT91SAM9261-CJ-999
• Description: IC MCU ARM9 ULTRA LP 217LFBGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM9261-CJ-999

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 190MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: DMA, LCD, POR, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: ROM
• Ram Size: 192K x 8
• Voltage - Supply (vcc/vdd): 1.08 V ~ 1.32 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 217-LFBGA
• For Use With: AT91SAM9261-EK - KIT EVAL FOR AT91SAM926EJ-SAT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

42.2.18
42.2.18.1
42.2.18.2
42.2.18.3
42.2.18.4
706
AT91SAM9261 Preliminary
USART
USART: CTS signal in Hardware Handshake
USART: RTS unexpected behavior
USART: TXD signal is Floating in Modem and Hardware Handshaking Mode
USART: DCD is Active High Instead of Low
Consequence: If the Device does not recognize the resume (<20 ms) event, then the Device will
remain in suspend state.
Host stack can do a port resume after it sets the HcControl.HCFS to USBOPERATIONAL.
When Hardware Handshaking is used and if CTS goes low near the end of the starting bit of the
transmitter, a character is lost.
CTS must not go low during a time slot comprised between 2 Master Clock periods before the
rising edge of the starting bit and 16 Master Clock periods after the rising edge of the starting bit.
None.
TXD signal should be pulled up in Modem and Hardware Handshaking mode.
TXD is multiplexed with a PIO which integrates a pull-up resistor. This internal pullup needs to
be enabled.
DCD signal is active at “High” level in USART block (Modem Mode).
DCD should be active at “Low” level.
Add an inverter.
1. Setting the receiver to hardware handshaking mode drops RTS line to low level even if
2. Disabling the receiver during a PDC transfert while RXBUFF flag is '0' has no effect on
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
the receiver is still turned off. USART needs to be completely configured and started
before setting the receiver to hardware handshaking mode.
RTS. The only way to get the RTS line rising to high level is to reset both PDMA buffers
by writing the value '0' in both counter registers.
6062M–ATARM–23-Mar-09