Appendix A Electrical Characteristics
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
1243
In
the timing characteristics for master mode are listed.
Figure A-9. Derating of maximum f
SCK
to f
bus
ratio in Master Mode
Table A-28. SPI Master Mode Timing Characteristics
Num
C
Characteristic
Symbol
Min
Typ
Max
Unit
1
D
SCK frequency
f
sck
1/2048
—
1
/
2
1
1
See
f
bus
1
D
SCK period
t
sck
2
—
2048
t
bus
2
D
Enable lead time
t
lead
—
1/2
—
t
sck
3
D
Enable lag time
t
lag
—
1/2
—
t
sck
4
D
Clock (SCK) high or low time
t
wsck
—
1/2
—
t
sck
5
D
Data setup time (inputs)
t
su
8
—
—
ns
6
D
Data hold time (inputs)
t
hi
8
—
—
ns
9
D
Data valid after SCK edge
t
vsck
—
—
15
ns
10
D
Data valid after SS fall (CPHA = 0)
t
vss
—
—
15
ns
11
D
Data hold time (outputs)
t
ho
0
—
—
ns
12
D
Rise and fall time inputs
t
rfi
—
—
8
ns
13
D
Rise and fall time outputs
t
rfo
—
—
8
ns
1/2
1/4
f
SCK
/f
bus
f
bus
[MHz]
10
20
30
40
15
25
35
5
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages