AT91SAM7S256C-MU Atmel, AT91SAM7S256C-MU Datasheet - Page 736

• Manufacturer Part Number: AT91SAM7S256C-MU
• Description: IC ARM7 MCU 32BIT 256K 64-QFN
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S256C-MU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Processor Series: AT91
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 64 KB
• Interface Type: SPI, TWI, USART, USB
• Maximum Clock Frequency: 55 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 5
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT91SAM7S256-MU; AT91SAM7S256-MU

40.20.9.2
40.20.9.3
40.20.9.4
40.20.9.5
40.20.10 Voltage Regulator
40.20.10.1
40.20.10.2
736
AT91SAM7S Series Preliminary
USART: CTS in Hardware Handshaking
USART: Hardware Handshaking – Two Characters Sent
USART: XOFF Character Bad Behavior
USART: DCD is active High instead of Low
Voltage Regulator: Current Consumption in Deep Mode
Voltage Regulator: Load Versus Temperature
When Hardware Handshaking is used and if CTS goes low near the end of the starting bit, a
character can be lost.
CTS must not go low during a time slot occurring between 2 Master Clock periods before the
starting bit and 16 Master Clock periods after the rising edge of the starting bit.
If CTS switches from 0 to 1 during the TX of a character and if the holding register (US_THR) is
not empty, the content of US_THR will also be transmitted.
Don't use the PDC in transmit mode and do not fill US_THR before TXEMPTY is set at 1.
The XOFF character is sent only when the receive buffer is detected full. While the XOFF is
being sent, the remote transmitter is still transmitting. As only one Holding register is available in
the receiver, characters will be lost in reception. This makes the software handshaking function-
ality ineffective.
None.
The DCD signal is active at High level in the USART Modem Mode.
DCD should be active at Low level.
Add an inverter.
Current consumption in Deep Mode is maximum 60 µA instead of 25 µA.
Due to current rejection from VDDIN to VDDCORE, the current consumption in Deep Mode can-
not be guaranteed. Instead, 60 µA is guaranteed whatever the condition.
None.
Maximum load is 50 mA at 85 °C (instead of 100 mA).
Maximum load is 100 mA at 70°C.
None.
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
6175K–ATARM–30-Aug-10