MC9S12HY64 Datasheet, PDF (751/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Electrical Characteristics
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
1
D SCK period
f_sck
DC
—
t_sck
4*t_bus1
MAX(1250, 4*t_bus)²
—
MIN(8,f_bus/4)⁽¹⁾
MHZ
MIN(0.8,f_bus/4)⁽²⁾
ns
∞
2
D Enable lead time
t_lead
4
—
—
t_bus
3
D Enable lag time
t_lag
4
—
—
t_bus
4
D Clock (SCK) high or low time
t_wsck
4
—
—
t_bus
5
D Data setup time (inputs)
t_su
8
—
—
ns
6
D Data hold time (inputs)
t_hi
8
—
—
ns
7
D
Slave access time (time to data
active)
t_a
—
—
20
ns
—
—
22
ns
8
D Slave MISO disable time
t_dis
—
—
220²
ns
9
D Data valid after SCK edge
t_vsck
—
10 D Data valid after SS fall
t_vss
—
29 + 0.5 ⋅ t_bus(3),
ns
—
220 + 0.5 ⋅ t_bus(4)
—
29 + 0.5 ⋅ t_bus3
ns
11 D Data hold time (outputs)
t_ho
17
—
—
ns
12 D Rise and fall time inputs
t_rfi
—
—
8
ns
8
ns
13 D Rise and fall time outputs
t_rfo
—
—
85²
1. SPI on non-motor pad ports (Port S or Por t H), or SPI on motor pad ports with all Slew Rate control disable
2. SPI on Port V with slew rate control enabled. All the SPI pins slew rate control should be enabled
3. 0.5 t_bus added due to internal synchronization delay
4. 0.5 t_bus added due to internal synchronization delay, SPI on Port V with slew rate control enabled. All the SPI pins slew
rate control should be enabled
4. MIN(8, f_bus/4) means select minimum frequency value from 8MHZ and f_bus/4MHZ. same for the other MIN(X,Y)
5. MAX(1250, 4*t_bus) means select the maximum period value from 1250ns and 4*t_bus ns.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
751