MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 873

• 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

E.3.2 KAPWR Filtering
MPC555 / MPC556
USER’S MANUAL
Where
Capacitance of the socket
Capacitance of the board trace
located very close to the chip.
Capacitance of the MPC555 / MPC556 XTAL pin is
Capacitance of the MPC555 / MPC556 EXTAL pin is
Tolerance of the capacitors taken into account is ±10%
KAPWR pin is the MPC555 / MPC556 keep-alive power. KAPWR is used for the crys-
tal oscillator circuit, and should be isolated from the noisy supplies. It is recommended
that an RC filter be used on KAPWR, or bypass capacitors which are located as close
as possible to the part.
C
C
C
L
socket
pad
is load capacitance
C
is pad capacitance
X
is socket and trace capacitance
is “real” capacitor
KAP 3 V
BOARD
C
C
Figure E-4 RC Filter Example
CLOCK AND BOARD GUIDELINES
XX
YY
50 Ω
C
C
100 nF
≤
=
=
XX
Rev. 15 October 2000
1pF
C
C
C
VSSSYN
≤
X
Y
=
1pF
+
+
C
C
C
YY
pad
pad
. It should be low since the crystal must be
=
+
+
2C
C
C
socket
socket
L
C
KAPWR
MPC555 / MPC556
C
pad
pad
∼
∼
7pF
7pF
MOTOROLA
E-5