
Appendix A Electrical Characteristics
MC9S12XDP512 Data Sheet, Rev. 2.21
1278
Freescale Semiconductor
In
Figure A-10 the timing diagram for slave mode with transmission format CPHA = 1 is depicted.
Figure A-10. SPI Slave Timing (CPHA = 1)
In
Table A-27 the timing characteristics for slave mode are listed.
Table A-27. SPI Slave Mode Timing Characteristics
Num
C
Characteristic
Symbol
Min
Typ
Max
Unit
1
D
SCK frequency
fsck
DC
—
1
/4fbus
1
D
SCK period
tsck
4—
∞
tbus
2
D
Enable lead time
tlead
4—
—
tbus
3
D
Enable lag time
tlag
4—
—
tbus
4
D
Clock (SCK) high or low time
twsck
4—
—
tbus
5
D
Data setup time (inputs)
tsu
8—
—
ns
6
D
Data hold time (inputs)
thi
8—
—
ns
7
D
Slave access time (time to data active)
ta
—
20
ns
8
D
Slave MISO disable time
tdis
—
22
ns
9
D
Data valid after SCK edge
tvsck
—
29 + 0.5
tbus1
1 0.5 t
bus added due to internal synchronization delay
ns
10
D
Data valid after SS fall
tvss
—
29 + 0.5
tbus1
ns
11
D
Data hold time (outputs)
tho
20
—
ns
12
D
Rise and fall time inputs
tr
——
8
ns
13
D
Rise and fall time outputs
trfo
——
8
ns
SCK
(Input)
SCK
(Input)
MOSI
(Input)
MISO
(Output)
1
5
6
MSB IN
Bit 6 . . . 1
LSB IN
MSB OUT
Slave LSB OUT
Bit 6 . . . 1
4
9
12
13
11
(CPOL = 0)
(CPOL = 1)
SS
(Input)
2
12
13
3
NOTE: Not dened
Slave
7
8
See
Note