Clock and Board Guidelines
MPC561/MPC563 Reference Manual, Rev. 1.2
C-4
Freescale Semiconductor
C.2
Crystal Oscillator External Components
Figure C-3. Crystal Oscillator Circuit
The load capacitances specified in
include all stray capacitance.
Tolerance of the capacitors is ±10%.
The oscillator capacitors C
X
and C
Y
were calculated as follows:
C
A
= C
B
= 2C
L
C
A
= C
X
+ C
PAD
+ C
SOCKET
C
B
= C
Y
+ C
PAD
+ C
SOCKET
Where:
C
L
is load capacitance
C
PAD
is pad capacitance
•
XTAL pad capacitance is C
PAD
= ~7 pF
Table C-1. External Components Value For Different Crystals (Q1)
Component
NDK CP32C
20 MHz
KINSEKI CX-11F
20 MHz
MURATA CCSTC
4 MHz
Units
C
L
1
1
C
L
according to crystal specification, C
L
= C
X
+ C
Y
.
6
14
—
pF
R
1
3
1MEG
3
1MEG
3
1MEG
3
Ohm
C
X
6
16
—
2
2
The Murata ceramic resonator includes the load capacitors. (8pF should be selected)
3. Resistor R
1
is currently not required. Space should be left on the board to add it in the future if
necessary.
pF
C
Y
6
16
—
pF
EXTAL
XTAL
CX
CY
R
1
1
VSSSYN
1. Resistor R
1
is currently not required. Space should be left on the board
to add it in the future if necessary.
Q
1
Board
MPC56x Device
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...