PXD20 Datasheet, PDF (123/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

4.18.11 I²C timing
Table 67. I²C input timing specifications—SCL and SDA
Electrical characteristics
Num Symbol C
Characteristic
Min. Value Max. Value
1 — CC¹ D Start condition hold time
2
—
2 — CC¹ D Clock low time
8
—
4 — CC¹ D Data hold time
0.0
—
6 — CC¹ D Clock high time
4
—
7 — CC¹ D Data setup time
0.0
—
8 — CC¹ D Start condition setup time (for repeated
2
—
start condition only)
9 — CC¹ D Stop condition setup time
2
—
1 _{Parameter values guaranteed by design.}
2 _{Inter Peripheral Clock is the clock at which the I}2_{C peripheral is working in the device}
Unit
IP-Bus Cycle²
IP-Bus Cycle²
ns
IP-Bus Cycle²
ns
IP-Bus Cycle²
IP-Bus Cycle²
SpecID
A12.1
A12.2
A12.3
A12.4
A12.5
A12.6
A12.7
Table 68. I²C Output timing specifications—SCL and SDA
Num Symbol C
Characteristic
Min. Value Max. Value
Unit
SpecID
1¹ — CC² D Start condition hold time
6
2¹ — CC² D Clock low time
10
3⁴ — CC² D SCL/SDA rise time
—
4¹ — CC² D Data hold time
7
5¹ — CC² D SCL/SDA fall time
—
6¹ — CC² D Clock high time
10
7¹ — CC² D Data setup time
2
8¹ — CC² D Start condition setup time (for repeated
20
start condition only)
9¹ — CC² D Stop condition setup time
10
—
IP-Bus Cycle³ A12.8
—
IP-Bus Cycle² A12.9
99.6
ns
A12.10
—
IP-Bus Cycle² A12.11
99.5
ns
A12.12
—
IP-Bus Cycle² A12.13
—
IP-Bus Cycle² A12.14
—
IP-Bus Cycle² A12.15
—
IP-Bus Cycle² A12.16
1 _{Programming IBFD (I}2_{C bus Frequency Divider) with the maximum frequency results in the minimum output timings listed. The}
I²C interface is designed to scale the data transition time, moving it to the middle of the SCL low period. The actual position is
affected by the prescale and division values programmed in IFDR.
2 _{Parameter values guaranteed by design.}
3 _{Inter Peripheral Clock is the clock at which the I}2_{C peripheral is working in the device}
4 _{Because SCL and SDA are open-drain-type outputs, which the processor can only actively drive low, the time SCL or SDA}
takes to reach a high level depends on external signal capacitance and pullup resistor values.
PXD20 Microcontroller Data Sheet, Rev. 2
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
123