Peripheral operating requirements and behaviors
1
SS
(OUTPUT)
2
10
10
11
11
4
3
SPSCK
(CPOL 0)
=
(OUTPUT)
5
5
SPSCK
(CPOL 1)
=
(OUTPUT)
6
7
MISO
(INPUT)
2
MSB IN
BIT 6 . . . 1
LSB IN
9
8
MOSI
(OUTPUT)
2
PORT DATA
BIT 6 . . . 1
MASTER LSB OUT
PORT DATA
MASTER MSB OUT
1.If configured as output
2. LSBF = 0. For LSBF = 1, bit order is LSB, bit 1, ..., bit 6, MSB.
Figure 10. SPI master mode timing (CPHA = 1)
Table 25. SPI slave mode timing on slew rate disabled pads
Num.
1
Symbol Description
Min.
Max.
fperiph/4
—
Unit
Hz
Note
1
fop
tSPSCK
tLead
tLag
Frequency of operation
0
2
SPSCK period
Enable lead time
Enable lag time
4 x tperiph
ns
2
3
1
—
tperiph
tperiph
ns
—
—
—
—
—
3
4
1
—
5
tWSPSCK Clock (SPSCK) high or low time
tperiph - 30
—
6
tSU
tHI
ta
Data setup time (inputs)
Data hold time (inputs)
Slave access time
2
7
—
ns
7
—
ns
8
—
—
—
0
tperiph
tperiph
22
ns
9
tdis
tv
Slave MISO disable time
Data valid (after SPSCK edge)
Data hold time (outputs)
Rise time input
ns
4
10
11
12
ns
—
—
—
tHO
tRI
tFI
—
ns
—
tperiph - 25
ns
Fall time input
13
tRO
tFO
Rise time output
—
25
ns
—
Fall time output
1. For SPI0 fperiph is the bus clock (fBUS). For SPI1 fperiph is the system clock (fSYS).
2. tperiph = 1/fperiph
3. Time to data active from high-impedance state
4. Hold time to high-impedance state
Table 26. SPI slave mode timing on slew rate enabled pads
Num.
Symbol Description
fop Frequency of operation
Table continues on the next page...
Min.
Max.
Unit
Note
1
0
fperiph/4
Hz
1
KL24 Sub-Family Data Sheet Data Sheet, Rev. 3, 9/19/2012.
38
Freescale Semiconductor, Inc.
FREESCALE [ Freescale ]
