AT91SAM7S64-MU Atmel, AT91SAM7S64-MU Datasheet - Page 622
AT91SAM7S64-MU
Manufacturer Part Number
AT91SAM7S64-MU
Description
IC ARM7 MCU FLASH 64K 64QFN
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM7S64-MU
Core Processor
ARM7
Core Size
16/32-Bit
Speed
55MHz
Connectivity
I²C, SPI, SSC, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
16K 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
For Use With
AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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40.6.12.3
40.6.12.4
40.6.12.5
40.6.13
40.6.13.1
40.6.13.2
40.6.14
40.6.14.1
622
AT91SAM7S Series Preliminary
Voltage Regulator
Watchdog Timer (WDT)
USART: XOFF Character Bad Behavior
USART: RXBRK Flag Error in Asynchronous Mode
USART: DCD is active High instead of Low
Voltage Regulator: Current Consumption in Deep Mode
Voltage Regulator: Load Versus Temperature
WDT: The Watchdog Timer May Lock the Device in a Reset State
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.
In receiver mode, when there are two consecutive characters (without timeguard in between),
RXBRK is not taken into account. As a result, the RXBRK flag is not enabled correctly and the
frame error flag is set.
Constraints on the transmitter device connected to the AT91SAM7S USART receiver side:
The transmitter may use the timeguard feature or send two STOP conditions. Only one STOP
condition is taken into account by the receiver state machine. After this STOP condition, as there
is no valid data, the receiver state machine will go in idle mode and enable the RXBRK flag.
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.
Under certain rare circumstances, if the Watchdog Timer is used with the Watchdog Reset
enabled (WDRSTEN set at 1), the Watchdog Timer may lock the device in a reset state when
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
6175K–ATARM–30-Aug-10
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