
MPC5121E/MPC5123 Data Sheet, Rev. 3
Electrical and Thermal Characteristics
Freescale Semiconductor
64
3.3.16
SPDIF
The Sony/Philips Digital Interface (SPDIF) timing is totally asynchronous, therefore there is no need for relationship with the
clock.
3.3.17
CAN
The CAN functions are available as TX and CAN3/4_RX pins at normal IO pads and as CAN1/2 RX pins at the VBAT_RTC
domain. There is no filter for the WakeUp dominant pulse. Any High-to-Low edge can cause WakeUp, if configured.
3.3.18
I2C
This section specifies the timing parameters of the Inter-Integrated Circuit (I2C) interface. Refere to the I2C-Bus Specification.
Table 39. I2C Input Timing Specifications – SCL and SDA
Sym
Description
Min
Max
Units
SpecID
1
Start condition hold time
2
—
IP-Bus Cycle1
1 Inter Peripheral Clock is defined in the MPC5121e/MPC5123 Reference Manual.
A18.1
2
Clock low time
8
—
IP-Bus Cycle1
A18.2
4
Data hold time
0.0
—
ns
A18.3
6
Clock high time
4
—
IP-Bus Cycle1
A18.4
7
Data setup time
0.0
—
ns
A18.5
8
Start condition setup time (for repeated start condition
only)
2
—
IP-Bus Cycle1
A18.6
9
Stop condition setup time
2
—
IP-Bus Cycle1
A18.7
Table 40. I2C Output Timing Specifications – SCL and SDA
Sym
Description
Min
Max
Units
SpecID
11
1 Programming IFDR 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.
Start condition hold time
6
—
IP-Bus Cycle2
2 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 pull-up resistor values
A18.8
Clock low time
10
—
A18.9
33
SCL/SDA rise time
—
7.9
ns
A18.10
Data hold time
7
—
A18.11
SCL/SDA fall time
—
7.9
ns
A18.12
Clock high time
10
—
A18.13
Data setup time
2
—
A18.14
Start condition setup time (for repeated start condition
only)
20
—
A18.15
Stop condition setup time
10
—
A18.16