MC56F8037EVM Freescale Semiconductor, MC56F8037EVM Datasheet - Page 43

• Manufacturer Part Number: MC56F8037EVM
• Description: BOARD EVAL FOR MC56F8037
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of MC56F8037EVM

• Contents: Board, Cables, CD, Debugger
• Silicon Manufacturer: Freescale
• Core Architecture: 56800/E
• Core Sub-architecture: 56800/E
• Silicon Core Number: MC56F
• Silicon Family Name: MC56F80xx
• Kit Contents: MC56F8037EVM, USB-JTAG Adapter, Cables, CD
• Rohs Compliant: Yes
• For Use With/related Products: MC56F8037
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.6 Ceramic Resonator
The internal crystal oscillator circuit is also designed to interface with a ceramic resonator in the frequency
range of 4-8MHz.
Follow the resonator supplier’s recommendations when selecting a resonator, since their parameters
determine the component values required to provide maximum stability and reliable start up. The load
capacitance values used in the resonator circuit design should include all stray layout capacitances. The
resonator and associated components should be mounted as near as possible to the EXTAL and XTAL pins
to minimize output distortion and start-up stabilization time.
3.7 External Clock Input - Crystal Oscillator Option
The recommended method of connecting an external clock is illustrated in
source is connected to XTAL and the EXTAL pin is grounded. The external clock input must be generated
using a relatively low impedance driver.
Freescale Semiconductor
2 Terminal
CL1
CL1
EXTAL XTAL
EXTAL XTAL
R
R
Figure 3-2
z
z
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
CL2
Figure 3-2 External Ceramic Resonator Circuit
CL2
Figure 3-1 External Crystal Oscillator Circuit
EXTAL XTAL
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
shows the typical 2 and 3 terminal ceramic resonators and their circuits.
R
z
C1
3 Terminal
56F8037/56F8027 Data Sheet, Rev. 7
EXTAL XTAL
R
z
Sample External Crystal Parameters:
R
Note: If the operating temperature range is limited to
C2
z
= 750 K
below 85
Sample External Ceramic Resonator Parameters:
R
z
= 750 K
o
C (105
o
C junction), then R
Figure
3-3. The external clock
z
= 10 Meg 
Ceramic Resonator
43