SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1423

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

45.10.3.2
Table 45-45. SPI Timings
11057A–ATARM–17-Feb-12
Symbol
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
SPI
Master Read Mode
Slave Read Mode
Slave Write Mode
0
1
2
3
4
5
6
7
8
9
SPI Timings
Parameter
MISO Setup time before SPCK rises (master)
MISO Hold time after SPCK rises (master)
SPCK rising to MOSI Delay (master)
MISO Setup time before SPCK falls (master)
MISO Hold time after SPCK falls (master)
SPCK falling to MOSI Delay (master)
SPCK falling to MISO Delay (slave)
MOSI Setup time before SPCK rises (slave)
MOSI Hold time after SPCK rises (slave)
SPCK rising to MISO Delay (slave)
The SPI is only sending data to a slave device such as an LCD, for example. The limit is
given by SPI
speed (see
pad.
T
DataFlash (AT45DB642D), T
In the formula above, F
In slave mode, SPCK is the input clock for the SPI. The max SPCK frequency is given by
setup and hold timings SPI
the pad limit, the limit in slave read mode is given by SPCK pad.
For 3.3V I/O domain and SPI6, F
before sampling data.
valid
f
f
SPCK
SPCK
is the slave time response to output data after detecting an SPCK edge. For Atmel SPI
Max
Max
Section 45.10.2 “I/O
2
=
=
(or SPI
--------------------------------------------------------
SPI
-------------------------------------------------------- -
SPI
0
6
5
orSPI
orSPI
) timing. Since it gives a maximum frequency above the maximum pad
SPCK
1
1
3
9
Max = 38.5 MHz @ VDDIO = 3.3V.
7
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
3.3V domain
1.8V domain
/SPI
valid
Conditions
+
+
T
T
Characteristics”), the max SPI frequency is the one from the
valid
(orT
8
SPCK
setup
(or SPI
v
Max = 33 MHz. T
) is 12 ns Max.
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
10
/SPI
11
). Since this gives a frequency well above
19.5
Min
0.5
1.5
15
16
20
0
0
0
0
0
0
setup
is the setup time from the master
Max
3.5
3.5
16
20
16
30
3
3
SAM3X/A
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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