MPC8248 Freescale Semiconductor, Inc, MPC8248 Datasheet - Page 16

• Manufacturer Part Number: MPC8248
• Description: Mpc8248 Powerquicc Ii Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

AC Electrical Characteristics
Table 10
Figure 3
16
1
Spec Number
Setup
sp16a sp17a FCC inputs—internal clock (NMSI)
sp16b sp17b FCC inputs—external clock (NMSI)
sp18a sp19a SCC/SMC/SPI/I2C inputs—internal clock (NMSI)
sp18b sp19b SCC/SMC/SPI/I2C inputs—external clock (NMSI)
sp20
sp22
measured at the pin.
Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of CLKIN. Timings are
Hold
sp21 TDM inputs/SI
sp23 PIO/TIMER/IDMA inputs
shows the FCC internal clock.
lists CPM input characteristics.
FCC output signals
FCC output signals
FCC input signals
Note: When GFMR[TCI] = 0
Note: When GFMR.[TCI] = 1
It is recommended that the rise/fall time on CPM input pins should not
exceed 5 ns. This should be enforced especially on clock signals. Rise time
refers to signal transitions from 10% to 90% of VCC; fall time refers to
transitions from 90% to 10% of VCC.
Although the specifications generally reference the rising edge of the clock,
the following AC timing diagrams also apply when the falling edge is the
active edge.
BRG_OUT
MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 1.5
sp16a
Characteristic
Table 10. AC Characteristics for CPM Inputs
NOTE: Rise/Fall Time on CPM Input Pins
Figure 3. FCC Internal Clock Diagram
NOTE
sp36a/sp37a
sp17a
MHz
2.5
66
6
6
4
3
8
MHz
2.5
83
6
6
4
3
8
Setup
MHz
100
2.5
6
6
4
3
8
1
MHz
133
Value (ns)
2.5
6
6
4
3
8
MHz
sp36a/sp37a
0.5
2.5
66
0
2
0
2
Freescale Semiconductor
MHz
0.5
2.5
83
0
2
0
2
Hold
MHz
100
2.5
0.5
0
2
0
2
MHz
133
2.5
0.5
0
2
0
2