AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 712
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT91SAM7S256D-AU
Manufacturer:
ATMEL
Quantity:
101
- Current page: 712 of 775
- Download datasheet (5Mb)
40.20.5.5
40.20.5.6
40.20.5.7
40.20.5.8
40.20.5.9
Use the CS in PIO mode when PDC mode is required and CS has to be maintained between transfers.
SPCK pin can toggle out before the first transfer in Master Mode.
In Master Mode, MSTR bit must be set (in SPI_MR register) before configuring SPI_CSRx registers.
In fixed Mode, if a transfer is performed through a PDC on a Chip select different from the Chip select 0, the output
spi_size sampled by the PDC will depend on the field, BITS (Bits per Transfer) of SPI_CSR0 register, whatever the
selected Chip select is. For example, if SPI_CSR0 is configured for a 10-bit transfer whereas SPI_CSR1 is config-
ured for an 8-bit transfer, when a transfer is performed in Fixed mode through the PDC, on Chip select 1, the
transfer will be considered as a HalfWord transfer.
If a PDC transfer has to be performed in 8 bits, on a Chip select y (y as different from 0), the BITS field of the
SPI_CSR0 must be configured in 8 bits, in the same way as the BITS field of the CSRy Register.
When Baudrate is set at 1 (i.e. when serial clock frequency equals the system clock frequency) and when the BITS
field of the SPI_CSR register (number of bits to be transmitted) equals an ODD value (in this case 9,11,13 or 15),
an additional pulse will be generated on output SPCK.
Everything is OK if the BITS field equals 8,10,12,14 or 16 and Baudrate = 1.
None.
The SPI disable is not possible in slave mode.
Read first the received data, then perform the software reset.
Bad Serial clock generation on the 2nd chip select when SCBR = 1, CPOL = 1 and NCPHA = 0.
This occurs using SPI with the following conditions:
Do not use a multiple Chip Select configuration where at least one SCRx register is configured with SCBR = 1 and
the others differ from 1 if NCPHA = 0 and CPOL = 1.
If all chip selects are configured with Baudrate = 1, the issue does not appear.
• Master Mode
• CPOL = 1 and NCPHA = 0
• Multiple chip selects are used with one transfer with Baud rate (SCBR) equal to 1 (i.e., when serial clock
• Transmitting with the slowest chip select and then with the fastest one, then an additional
frequency equals the system clock frequency) and the other transfers set with SCBR are not equal to 1
on output SPCK during the second transfer.
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
SPI: SPCK Behavior in Master Mode
SPI: Chip Select and Fixed Mode
SPI: Baudrate Set to 1
SPI: Disable In Slave Mode
SPI: Bad Serial Clock Generation on 2nd Chip Select
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
pulse is generated
712
Related parts for AT91SAM7S256D-AU
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
KIT EVAL FOR ARM AT91SAM7S
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
MCU, MPU & DSP Development Tools KICKSTART KIT ATMEL AT91SAM7S
Manufacturer:
IAR Systems
Part Number:
Description:
MCU ARM9 64K SRAM 144-LFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM7 MCU FLASH 256K 100LQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM9 MPU 217-LFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
MCU ARM9 ULTRA LOW PWR 217-LFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
MCU ARM9 324-TFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC MCU ARM9 SAMPLING 217CBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM9 MCU 217-LFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM9 MCU 208-PQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
MCU ARM 512K HS FLASH 100-LQFP
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
MCU ARM 512K HS FLASH 100-TFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM9 MCU 200 MHZ 324-TFBGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM MCU 16BIT 128K 256BGA
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
IC ARM7 MCU 32BIT 128K 64LQFP
Manufacturer:
Atmel
Datasheet: