MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 271

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MPC555
USER’S MANUAL
System Frequency (FREQ
The system clocks GCLK1 and GCLK2 frequency is:
Therefore, the complete equation for determining the system clock frequency is:
The clocks GCLK1_50 and GCLK2_50 frequency is:
Figure 8-7
where FREQsysmax = System Frequency (FREQ
/
MPC556
GCLK1 Divide by 1
GCLK2 Divide by 1
GCLK1 Divide by 2
GCLK2 Divide by 2
GCLK1 Divide by 4
GCLK2 Divide by 4
shows the timing of USIU clocks when DFNH = 1 or DFNL = 0.
Figure 8-6 Divided System Clocks Timing Diagram
FREQ
FREQ
SYS
50
CLOCKS AND POWER CONTROL
=
) =
------------------------------------------------------- -
(
sys
2
Rev. 15 October 2000
DFNH
FREQsysmax
OSCCLK
DIVF + 1
=
------------------------------------------------------- -
(
)or 2
2
DFNH
FREQsysmax
(
SYS
DFNL
)or 2
)/2
x
(
+
1
DFNL
(2
)
×
DFNH
--------------------------
EBDF
+
1
(MF + 1)
)
or 2
1
+
DFNL + 1
1
)
x
MOTOROLA
2
2
8-11