Electrical Specifications
Serial Peripheral Interface Characteristics (VDD = 5.0 Vdc ± 10%)
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0 Advance Information
MOTOROLA Electrical Specifications 373
22.9 Serial Peripheral Interface Characteristics (VDD = 5.0 Vdc ± 10%)
Diagram
Number(1)
1. All timing is shown with resp ect to 20% VDD and 70% VDD, unless otherwise noted; assumes 100 pF load on all SPI pins
Characteristic(2)
2. Numbers refer to dimensions in Figure 22-1 and Figure 22-2.
Symbol Min Max Unit
Operating frequency
Master
Slave
fOP(M)
fOP(S)
fOP/128
dc
fOP/2
fOP
MHz
1Cycle time
Master
Slave
tCYC(M)
tCYC(S)
2
1128
tCYC
2 Enable lead time tLead(S) 15 — ns
3 Enable lag time tLag(S) 15 ns
4Clock (SPCK) high time
Master
Slave
tSCKH(M)
tSCKH(S)
100
50
ns
5Clock (SPCK) low time
Master
Slave
tSCKL(M)
tSCKL(S)
100
50
ns
6Data setup time (inputs)
Master
Slave
tSU(M)
tSU(S)
45
5
ns
7Data hold time (inputs)
Master
Slave
tH(M)
tH(S)
0
15
ns
8Access time, slave(3)
CPHA = 0
CHPA = 1
3. Time to data active from high-impedance state
tA(CP0)
tA(CP1)
0
040
20 ns
9Disable time, slave(4)
4. Hold time to high-impedance state
tDIS(S) —25ns
10 Data valid time after enable edge
Master
Slave(5)
5. With 100 pF on all SPI pins
tV(M)
tV(S)
10
40 ns