I2C AC Electrical Specifications
2
11.11I C AC Electrical Specifications
Table 11-24 provides the I2C (SCL < 100 kHz) timings.
2
Table 11-24. I C Timing (SCL < 100 kHZ)
All Frequencies
Num
Characteristic
Unit
Min
Max
200 SCL clock frequency (slave)
200 SCL clock frequency (master)
0
100
100
—
kHz
kHz
µs
µs
µs
µs
µs
µs
ns
1
1.5
4.7
4.7
4.0
4.7
4.0
0
202 Bus free time between transmissions
203 Low period of SCL
—
204 High period of SCL
205 Start condition setup time
206 Start condition hold time
207 Data hold time
—
—
—
—
208 Data setup time
250
—
—
209 SDL/SCL rise time
1
µs
ns
210 SDL/SCL fall time
—
300
—
211 Stop condition setup time
4.7
µs
1
SCL frequency is given by SCL = BRGCLK_frequency / ((BRG register + 3 × pre_scaler × 2).
The ratio SYNCCLK/(BRGCLK / pre_scaler) must be greater or equal to 4/1.
Table 11-25 provides the I2C (SCL > 100 kHz) timings.
2
Table 11-25. . I C Timing (SCL > 100 kHZ)
All Frequencies
Num
Characteristic
Expression
Unit
Min
Max
200 SCL clock frequency (slave)
200 SCL clock frequency (master)
fSCL
fSCL
0
BRGCLK/48
Hz
Hz
s
1
BRGCLK/16512
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
1/(2.2 * fSCL)
0
BRGCLK/48
202 Bus free time between transmissions
203 Low period of SCL
—
—
s
204 High period of SCL
205 Start condition setup time
206 Start condition hold time
207 Data hold time
—
s
—
s
—
s
—
—
s
208 Data setup time
1/(40 * fSCL)
—
s
209 SDL/SCL rise time
1/(10 * fSCL)
1/(33 * fSCL)
—
s
210 SDL/SCL fall time
—
s
211 Stop condition setup time
1/2(2.2 * fSCL)
s
64
MPC860 Family Hardware Specifications
MOTOROLA
MOTOROLA [ MOTOROLA ]
