MCF53017_10 Datasheet, PDF (36/62 Pages) Freescale Semiconductor, Inc – Version 3 ColdFire® core with EMAC

Preliminary Electrical Characteristics
Table 19. I²C Input Timing Specifications between SCL and SDA (continued)
Num
Characteristic
Min Max
I5 I2C_SCL/I2C_SDA fall time (V_IH = 2.4 V to V_IL = 0.5 V)
I6 Clock high time
—
1
4
—
I7 Data setup time
0
—
I8 Start condition setup time (for repeated start condition only) 2
—
I9 Stop condition setup time
2
—
Units
ms
t_cyc
ns
t_cyc
t_cyc
Table 20 lists specifications for the I²C output timing parameters shown in Figure 22.
Table 20. I²C Output Timing Specifications between SCL and SDA
Num
Characteristic
Min
Max
Units
I1¹ Start condition hold time
6
—
t_cyc
I2 ¹ Clock low period
10
—
t_cyc
I3 ² I2C_SCL/I2C_SDA rise time (V_IL = 0.5 V to V_IH = 2.4 V)
—
—
µs
I4 ¹ Data hold time
7
—
t_cyc
I5 ³ I2C_SCL/I2C_SDA fall time (V_IH = 2.4 V to V_IL = 0.5 V)
—
3
ns
I6 ¹ Clock high time
10
—
t_cyc
I7 ¹ Data setup time
2
—
t_cyc
I8 ¹ Start condition setup time (for repeated start condition only)
20
—
t_cyc
I9 ¹ Stop condition setup time
10
—
t_cyc
1 _{Output numbers depend on the value programmed into the IFDR; an IFDR programmed with the maximum}
frequency (IFDR = 0x20) results in minimum output timings as shown in Table 20. The I²C 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 IFDR; however, the numbers
given in Table 20 are minimum values.
2 _{Because I2C_SCL and I2C_SDA are open-collector-type outputs, which the processor can only actively}
drive low, the time I2C_SCL or I2C_SDA take to reach a high level depends on external signal capacitance
and pull-up resistor values.
3 _{Specified at a nominal 50-pF load.}
Figure 22 shows timing for the values in Table 20 and Table 19.
I5
I2
I6
I2C_SCL
I7
I1
I4
I8
I3
I9
I2C_SDA
Figure 22. I²C Input/Output Timings
MCF5301x Data Sheet, Rev. 5
36
Preliminary—Subject to Change Without Notice
Freescale Semiconductor