AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 675

• 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

40.14.3.2
40.14.3.3
40.14.4
40.14.4.1
40.14.5
40.14.5.1
When Channel Period Register equals 0, the period update is not operational.
Do not write 0 in the period register.
In left aligned mode, the first start value of the counter is 0. For the other periods, the counter starts at 1.
None.
If an event (RTTINC or ALMS) occurs within the same slow clock cycle during which the RTT_SR is read, the cor-
responding bit might be cleared. This can lead to the loss of this event.
The software must handle the RTT event as an interrupt and should not poll RTT_SR.
The DCD signal is active at High level in the USART Modem Mode.
DCD should be active at Low level.
Add an inverter.
Real Time Timer (RTT)
USART: Universal Synchronous Asynchronous Receiver Transmitter
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround:
Problem Fix/Workaround
PWM: Update when PWM_CPRDx = 0
PWM: Counter Start Value
RTT: Possible Event Loss when Reading RTT_SR
USART: DCD is active High instead of Low
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
675