MPC857T Freescale Semiconductor, Inc, MPC857T Datasheet - Page 67

• Manufacturer Part Number: MPC857T
• Description: Mpc857t Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

11.12 I
Table 26
Table 27
Freescale Semiconductor
1
1
Num
Num
The ratio SyncClk/(BRGCLK/pre_scaler) must be greater or equal to 4/1.
The ratio SyncClk/(Brg_Clk/pre_scaler) must be greater or equal to 4/1.
200
200
202
203
204
205
206
207
208
209
210
211
200
200
202
203
204
205
206
207
208
209
210
211
SCL frequency is given by SCL = BRGCLK_frequency / ((BRG register + 3) * pre_scaler * 2).
SCL frequency is given by SCL = BrgClk_frequency / ((BRG register + 3) * pre_scaler * 2).
provides the I
provides the I
2
C AC Electrical Specifications
SCL clock frequency (slave)
SCL clock frequency (master)
Bus free time between transmissions
Low period of SCL
High period of SCL
Start condition setup time
Start condition hold time
Data hold time
Data setup time
SDL/SCL rise time
SDL/SCL fall time
Stop condition setup time
SCL clock frequency (slave)
SCL clock frequency (master)
Bus free time between transmissions
Low period of SCL
High period of SCL
Start condition setup time
Start condition hold time
Data hold time
Data setup time
SDL/SCL rise time
SDL/SCL fall time
Stop condition setup time
MPC862/857T/857DSL PowerQUICC™ Family Hardware Specifications, Rev. 3
2
2
Characteristic
C (SCL < 100 KHz) timings.
C (SCL > 100 kHz) timings.
Table 27. I
Table 26. I
Characteristic
1
1
2
2
C Timing (SCL < 100 KH
C Timing (SCL > 100 kH
Expression
fSCL
fSCL
—
—
—
—
—
—
—
—
—
—
BRGCLK/16512
1/2(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(40 * fSCL)
Min
—
—
0
0
Z
Z
)
)
All Frequencies
All Frequencies
Min
250
1.5
4.7
4.7
4.0
4.7
4.0
4.7
—
—
0
0
1/(10 * fSCL)
1/(33 * fSCL)
BRGCLK/48
BRGCLK/48
CPM Electrical Characteristics
Max
—
—
—
—
—
—
—
—
Max
100
100
300
—
—
—
—
—
—
—
—
1
Unit
Unit
kHz
kHz
Hz
Hz
μs
μs
μs
μs
μs
μs
ns
μs
ns
μs
s
s
s
s
s
s
s
s
s
s
67