MC9S12DT256 Device User Guide — V03.07
120
Figure A-7 SPI Master Timing (CPHA=1)
In Table A-19 the timing characteristics for master mode are listed.
Table A-19 SPI Master Mode Timing Characteristics
Num
Characteristic
Symbol
Unit
Min
Typ
Max
1
SCK Frequency
f
sck
1/2048
—
1
/
2
f
bus
1
SCK Period
t
sck
2
—
2048
t
bus
2
Enable Lead Time
t
lead
—
1/2
—
t
sck
3
Enable Lag Time
t
lag
—
1/2
—
t
sck
4
Clock (SCK) High or Low Time
t
wsck
—
1/2
—
t
sck
5
Data Setup Time (Inputs)
t
su
8
—
—
ns
6
Data Hold Time (Inputs)
t
hi
8
—
—
ns
9
Data Valid after SCK Edge
t
vsck
—
—
30
ns
10
Data Valid after SS fall (CPHA=0)
t
vss
—
—
15
ns
11
Data Hold Time (Outputs)
t
ho
20
—
—
ns
12
Rise and Fall Time Inputs
t
rfi
—
—
8
ns
13
Rise and Fall Time Outputs
t
rfo
—
—
8
ns
SCK
(OUTPUT)
SCK
(OUTPUT)
MISO
(INPUT)
MOSI
(OUTPUT)
1
5
6
MSB IN
2
BIT 6 . . . 1
LSB IN
MASTER MSB OUT
2
MASTER LSB OUT
BIT 6 . . . 1
4
4
9
12
13
11
PORT DATA
(CPOL
=
0)
(CPOL
=
1)
PORT DATA
SS
1
(OUTPUT)
2
12
13
3
1.If configured as output
2. LSBF = 0. For LSBF = 1, bit order is LSB, bit 1, ..., bit 6, MSB.
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