Motorola MC9S12A256, User Manual

Page: 122 / 132

MC9S12DT256 Device User Guide — V03.07
122
Figure A-9 SPI Slave Timing (CPHA=1)
In Table A-20 the timing characteristics for slave mode are listed.
Table A-20 SPI Slave Mode Timing Characteristics
Num Characteristic Symbol Unit
Min Typ Max
1 SCK Frequency
f
sck
DC — 1
/
4
f
bus
1 SCK Period
t
sck
4 —
t
bus
2 Enable Lead Time
t
lead
4 — —
t
bus
3 Enable Lag Time
t
lag
4 — —
t
bus
4 Clock (SCK) High or Low Time
t
wsck
4 — —
t
bus
5 Data Setup Time (Inputs)
t
su
8 — — ns
6 Data Hold Time (Inputs)
t
hi
8 — — ns
7 Slave Access Time (time to data active)
t
a
— — 20 ns
8 Slave MISO Disable Time
t
dis
— — 22 ns
9 Data Valid after SCK Edge
t
vsck
— — 30 + t
bus
1
NOTES
:
1. t
bus
added due to internal synchronization delay
ns
10 Data Valid after SS fall
t
vss
— —
30 + t
bus
1
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
(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 4
9
12 13
11
(CPOL
=
0)
(CPOL
=
1)
SS
(INPUT)
2
12 13
3
NOTE: Not defined!
SLAVE
7
8
see
note
∞