SCF5249VM140 FREESCALE [Freescale Semiconductor, Inc], SCF5249VM140 Datasheet - Page 41

• Manufacturer Part Number: SCF5249VM140
• Description: Integrated ColdFire Microprocessor
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale Semiconductor
SDA
SCL
1.
2.
3.
Num
M1
M2
M3
M4
M5
M6
M7
M8
M9
Num
M9
Note: Output numbers are dependent on the value programmed into the MFDR; an MFDR programmed
with the maximum frequency (MFDR = 0x20) will result in minimum output timings as shown in the above
table. The MBUS interface is designed to scale the actual data transition time to move it to the middle of
the SCL low period. The actual position is affected by the prescale and division values programmed into
the MFDR; however, numbers given in the above table are the minimum values.
Since SCL and SDA are open-collector-type outputs, which the processor can only actively drive low, the
time required for SCL or SDA to reach a high level depends on external signal capacitance and pull-up
resistor values.
Specified at a nominal 20 pF load.
1
1
2
1
3
1
1
1
1
Table 27. I2C-Bus Output Timing Specifications Between SCL and SDA
Table 26. I2C-Bus Input Timing Specifications Between SCL and SDA
M1
Start Condition Hold Time
Clock Low Period
SCL/SDA Rise Time
(V
Data Hold Time
SCL/SDA Fall Time
(V
Clock High time
Data Setup Time
Start Condition Setup Time
(for repeated start condition only)
Stop Condition Setup Time
Stop Condition Setup Time
IL
IH
SCF5249 Integrated ColdFire® Microprocessor Data Sheet, Rev. 3
= 0.5 V to V
= 2.4 V to V
M2
M4
IH
IL
= 2.4 V)
= 0.5 V)
Figure 13. I2C Timing Definition
Characteristic
Characteristic
M6
M7
M8
Min
tbd
Min
tbd
tbd
tbd
tbd
tbd
tbd
tbd
—
—
Max
—
Max
M5
tbd
tbd
—
—
—
—
—
—
—
M3
bus clocks
Electrical Characteristics
bus clocks
bus clocks
bus clocks
bus clocks
bus clocks
bus clocks
bus clocks
Units
mSec
Units
nSec
M9
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