mcf51mm256 Freescale Semiconductor, Inc, mcf51mm256 Datasheet - Page 39

• Manufacturer Part Number: mcf51mm256
• Description: 32-bit Coldfire V1 Central Processor Unit
• Manufacturer: Freescale Semiconductor, Inc

3.12.2
Synchronizer circuits determine the shortest input pulses that can be recognized or the fastest clock that
can be used as the optional external source to the timer counter. These synchronizers operate from the
current bus rate clock.
Freescale Semiconductor
#
1
2
3
4
5
TPM Timing
RESET PIN
—
—
C
D
D
D
TPMxCLK
External clock frequency
External clock period
External clock high time
External clock low time
Input capture pulse width
IRQ/KBIPx
IRQ/KBIPx
Figure 13. Timer External Clock
Function
Figure 12. IRQ/KBIPx Timing
Table 21. TPM Input Timing
Figure 11. Reset Timing
t
clkh
t
t
t
TPMext
IHIL
ILIH
t
extrst
Symbol
t
f
t
clkl
TPMext
TPMext
t
ICPW
t
t
clkh
clkl
Preliminary Electrical Characteristics
Min
1.5
1.5
1.5
dc
4
f
Max
Bus
—
—
—
—
/4
MHz
Unit
t
t
t
t
cyc
cyc
cyc
cyc
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