SAM7S16 Atmel Corporation, SAM7S16 Datasheet - Page 741

• Manufacturer Part Number: SAM7S16
• Manufacturer: Atmel Corporation

Specifications of SAM7S16

• Flash (kbytes): 16 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 55 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 21
• Ext Interrupts: 21
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Ssc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

40.21.5.4
40.21.5.5
40.21.5.6
40.21.5.7
40.21.5.8
40.21.5.9
6175L–ATARM–28-Jul-11
SPI: LASTXFER (Last Transfer) behavior
SPI: SPCK Behavior in Master Mode
SPI: Chip Select and Fixed Mode
SPI: Baudrate Set to 1
SPI: Disable In Slave Mode
SPI: Disable Issue
Do not use the combination CSAAT=1 and SCBR =1.
In FIXED Mode, with CSAAT bit set, and in “PDC mode” the Chip Select can rise depending on
the data written in the SPI_TDR when the TX_EMPTY flag is set. If for example, the PDC writes
a “1” in the bit 24 (LASTXFER bit) of the SPI_TDR, the chip select will rise as soon as the
TXEMPTY flag is set.
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 Trans-
fer) 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 configured for an 8-bit transfer, when a
transfer is performed in Fixed mode through the PDC, on Chip select 1, the transfer will be con-
sidered 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.
The SPI Command “SPI Disable” is not possible during a transfer, it must be performed only
after TX_EMPTY rising else there is everlasting dummy transfers occur.
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
SAM7S Series
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