AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 623
AT91SAM7S256D-AU
Manufacturer Part Number
AT91SAM7S256D-AU
Description
ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
Manufacturer
Atmel
Series
SAM7S256r
Datasheet
1.AT91SAM7S256D-AU.pdf
(775 pages)
Specifications of AT91SAM7S256D-AU
Rohs
yes
Core
ARM
Processor Series
AT91SAM
Data Bus Width
16 bit/32 bit
Maximum Clock Frequency
55 MHz
Program Memory Size
256 KB
Data Ram Size
64 KB
On-chip Adc
Yes
Operating Supply Voltage
3 V to 3.6 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
LQFP-64
Mounting Style
SMD/SMT
Interface Type
2-Wire, I2S, SPI, USART
Length
7 mm
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40.6.13
40.6.13.1
40.6.13.2
40.6.14
40.6.14.1
40.6.14.2
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 cannot 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 the user restarts the watchdog
(WDDRSTT). The only way to recover from this state is a power-on reset. The issue depends on the values of
WDD and WDV in the WDT_MR register.
Two workarounds are possible.
Under certain rare circumstances, if the Watchdog Timer is used with the Watchdog Fault Interrupt enabled
(WDFIEN set at 1), the Watchdog Timer may trigger the interrupt (wdt_fault) erroneously. The Watchdog Timer
Status Register may be wrong also (WDERR and WDUNF). The issue depends on the values of WDD and WDV in
the WDT_MR register.
Two workarounds are possible.
1. Either do not use the Watchdog Timer with the Watchdog Reset enabled (WDRSTEN set at 1),
2. or set WDD to 0xFFF and in addition use only one of the following values for WDV: 0xFFF, 0xDFF, 0xBFF,
1. Either do not us the Watchdog Timer with the Watchdog fault Interrupt enabled (WDFIEN set at 1),
2. or set WDD to 0xFFF and in addition use only one of the following values for WDV: 0xFFF, 0xDFF, 0xBFF,
Voltage Regulator
Watchdog Timer (WDT)
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Voltage Regulator: Current Consumption in Deep Mode
Voltage Regulator: Load Versus Temperature
WDT: The Watchdog Timer May Lock the Device in a Reset State
WDT: The Watchdog Timer Status Register and Interrupt
0x9FF, 0x7FF, 0x77F, 0x6FF, 0x67F, 0x5FF, 0x57F, 0x4FF, 0x47F, 0x3FF, 0x37F, 0x2FF, 0x27F, 0x1FF,
0x1BF, 0x17F, 0x13F, 0x0FF, 0x0DF, 0x0BF, 0x09F, 0x07F, 0x06F, 0x05F, 0x04F, 0x03F, 0x037, 0x02f,
0x027, 0x01F, 0x01B, 0x017, 0x013 and 0x00F.
0x9FF, 0x7FF, 0x77F, 0x6FF, 0x67F, 0x5FF, 0x57F, 0x4FF, 0x47F, 0x3FF, 0x37F, 0x2FF, 0x27F, 0x1FF,
0x1BF, 0x17F, 0x13F, 0x0FF, 0x0DF, 0x0BF, 0x09F, 0x07F, 0x06F, 0x05F, 0x04F, 0x03F, 0x037, 0x02f,
0x027, 0x01F, 0x01B, 0x017, 0x013 and 0x00F.
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
623
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