SAM7S64 Atmel Corporation, SAM7S64 Datasheet - Page 622
SAM7S64
Manufacturer Part Number
SAM7S64
Description
Manufacturer
Atmel Corporation
Specifications of SAM7S64
Flash (kbytes)
64 Kbytes
Pin Count
64
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
16
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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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
SAM7S Series
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 SAM7S 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
6175L–ATARM–28-Jul-11
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