Datasheet

Appendix A Electrical Characteristics
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5
278 Freescale Semiconductor
Figure A-11. Timer External Clock
Figure A-12. Timer Input Capture Pulse
A.8.3 SPI Timing
Table A-11 and Figure A-13 through Figure A-16 describe the timing requirements for the SPI system.
Table A-10. TPM/MTIM Input Timing
Function Symbol Min Max Unit
External clock frequency f
TCLK
0f
Bus
/4 Hz
External clock period t
TCLK
4—t
cyc
External clock high time t
clkh
1.5 — t
cyc
External clock low time t
clkl
1.5 — t
cyc
Input capture pulse width t
ICPW
1.5 — t
cyc
Table A-11. SPI Timing
No. Function Symbol Min Max Unit
Operating frequency
Master
Slave
f
op
f
Bus
/2048
0
f
Bus
/2
f
Bus
/4
Hz
1 SPSCK period
Master
Slave
t
SPSCK
2
4
2048
—
t
cyc
t
cyc
2 Enable lead time
Master
Slave
t
Lead
1/2
1
—
—
t
SPSCK
t
cyc
3 Enable lag time
Master
Slave
t
Lag
1/2
1
—
—
t
SPSCK
t
cyc
t
TCLK
t
clkh
t
clkl
TCLK
t
ICPW
TPMCHn
t
ICPW
TPMCHn