AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 450

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

29.8.9
Name:
Addresses:
Access:
Note:
• CPOL: Clock Polarity
0 = The inactive state value of SPCK is logic level zero.
1 = The inactive state value of SPCK is logic level one.
CPOL is used to determine the inactive state value of the serial clock (SPCK). It is used with NCPHA to produce the
required clock/data relationship between master and slave devices.
• NCPHA: Clock Phase
0 = Data is changed on the leading edge of SPCK and captured on the following edge of SPCK.
1 = Data is captured on the leading edge of SPCK and changed on the following edge of SPCK.
NCPHA determines which edge of SPCK causes data to change and which edge causes data to be captured. NCPHA is
used with CPOL to produce the required clock/data relationship between master and slave devices.
• CSAAT: Chip Select Active After Transfer
0 = The Peripheral Chip Select Line rises as soon as the last transfer is achieved.
1 = The Peripheral Chip Select does not rise after the last transfer is achieved. It remains active until a new transfer is
requested on a different chip select.
• BITS: Bits Per Transfer (See the
The BITS field determines the number of data bits transferred. Reserved values should not be used.
6438F–ATARM–21-Jun-10
31
23
15
7
SPI_CSRx registers must be written even if the user wants to use the defaults. The BITS field will not be updated with the trans-
lated value unless the register is written.
SPI Chip Select Register
30
22
14
SPI_CSR0... SPI_CSR3
0xFFFA4030 (0), 0xFFFA8030 (1)
Read/Write
6
BITS
0000
0001
0010
0011
0100
0101
0110
0111
BITS
(Note:)
29
21
13
5
below the register table;
28
20
12
4
DLYBCT
DLYBS
SCBR
CSAAT
Section 29.8.9 “SPI Chip Select Register” on page
27
19
11
3
Bits Per Transfer
26
18
10
–
2
10
11
12
13
14
15
8
9
AT91SAM9G45
NCPHA
25
17
9
1
CPOL
24
16
8
0
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