AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 699

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

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

40.18.2
40.18.2.1
40.18.3
40.18.3.1
40.18.3.2
40.18.4
40.18.4.1
40.18.4.2
The maximum number of write/erase cycles for Non Volatile Memory bits is 100. This includes Lock Bits (LOCKx),
General Purpose NVM bits (GPNVMx) and the Security Bit.
This maximum number of write/erase cycles is not applicable to 64 KB Flash memory, it remains at10K for the
Flash memory.
None.
When NRST or PA0-PA16 or PA21-PA31 are set as digital inputs with pull-up enabled, the voltage of the I/O stabi-
lizes at VPull-up.
Vpull-up
This condition causes a leakage through VDDIO. This leakage is 45 µA per pad in worst case at 3.3 V and 25 µA at
1.8V.
I Leakage
It is recommended to use an external pull-up if needed.
When NRST or PA0-PA16 and or PA21-PA31 are set as digital inputs with pull-up enabled, driving the I/O with an
output impedance higher than 500 ohms may not drive the I/O to a logical zero.
Output impedance must be lower than 500 ohms.
If the Channel Counter Register value is 0 or 1, the Channel Period Register or Channel Duty Cycle Register is
directly modified when writing the Channel Update Register.
Check the Channel Counter Register before writing the update register.
When Channel Period Register equals 0, the period update is not operational.
VPull-up Min
VDDIO - 0.65 V
Parameter
I Leakage at 3,3V
I Leakage at 1.8V
Non Volatile Memory Bits (NVM Bits)
Parallel Input/Output Controller (PIO)
Pulse Width Modulation Controller (PWM)
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
NVM Bits: Write/Erase Cycles Number
PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
PWM: Update when PWM_CCNTx = 0 or 1
PWM: Update when PWM_CPRDx = 0
VPull-up Max
VDDIO - 0.45 V
Typ
2.5
1
µA
µA
Max
45
25
µA
µA
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
699