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| MC9S08AC16_08 Datasheet, PDF (136/344 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU) | |||
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Chapter 8 Internal Clock Generator (S08ICGV4)
selected, this pin is not used by the ICG. The oscillator is capable of being conï¬gured to provide a higher
amplitude output for improved noise immunity. This mode of operation is selected by HGO = 1.
8.2.3 External Clock Connections
If an external clock is used, then the pins are connected as shown Figure 8-4.
ICG
EXTAL
VSS
XTAL
NOT CONNECTED
CLOCK INPUT
Figure 8-4. External Clock Connections
8.2.4 External Crystal/Resonator Connections
If an external crystal/resonator frequency reference is used, then the pins are connected as shown in
Figure 8-5. Recommended component values are listed in the Electrical Characteristics chapter.
ICG
EXTAL
VSS
XTAL
RS
C1
C2
RF
CRYSTAL OR RESONATOR
Figure 8-5. External Frequency Reference Connection
MC9S08AC16 Series Data Sheet, Rev. 6
136
Freescale Semiconductor
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