AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 612

• 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

40.5.7.2
40.5.7.3
40.5.8
40.5.8.1
40.5.8.2
40.5.8.3
If TK is programmed as output and TF is programmed as input, it is impossible to emit data when the start of edge
(rising or falling) of synchro has a Start Delay equal to zero.
None.
If TK is programmed as an input and TF is programmed as an output and requested to be set to low/high during
data emission, the Frame Synchro signal is generated one bit clock period after the data start and one data bit is
lost. This problem does not exist when generating a periodic synchro.
The data need to be delayed for one bit clock period with an external assembly. In the following schematic, TD, TK
and NRST are SAM7S signals, TXD is the delayed data to connect to the device.
The value of CLDIV x 2
equal to 8191⋅
None.
when a software reset is performed during a frame and when TWCK is low, it is impossible to initiate a new transfer
in READ or WRITE mode.
None.
Any transfer in progress is immediately frozen if the Control Register (TWI_CR) is written with the bit MSDIS at 1.
Furthermore, the status bits TXCOMP and TXRDY in the Status Register (TWI_SR) are not reset.
Two-wire Interface (TWI)
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
SSC: Transmitter Limitations in Slave Mode
SSC: Transmitter Limitations in Slave Mode
TWI: Clock Divider
TWI: Software Reset
TWI: Disabling Does not Operate Correctly
CKDIV
must be less than or equal to 8191, the value of CHDIV x 2
SAM7S Series [DATASHEET]
CKDIV
6175M–ATARM–26-Oct-12
must be less than or
612