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| S912XEG384J3VA Datasheet, PDF (501/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family | |||
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Chapter 12 Pierce Oscillator (S12XOSCLCPV2)
from the EXTAL input frequency. In full stop mode (PSTP = 0), the EXTAL pin is pulled down by an
internal resistor of typical 200 kâ¦.
NOTE
Freescale recommends an evaluation of the application board and chosen
resonator or crystal by the resonator or crystal supplier.
Loop controlled circuit is not suited for overtone resonators and crystals.
EXTAL
MCU
C1
Crystal or
Ceramic Resonator
XTAL
C2
VSSPLL
Figure 12-2. Loop Controlled Pierce Oscillator Connections (LCP mode selected)
NOTE
Full swing Pierce circuit is not suited for overtone resonators and crystals
without a careful component selection.
EXTAL
C1
MCU
XTAL
RB
RS*
Crystal or
Ceramic Resonator
C2
VSSPLL
* Rs can be zero (shorted) when use with higher frequency crystals.
Refer to manufacturerâs data.
Figure 12-3. Full Swing Pierce Oscillator Connections (FSP mode selected)
EXTAL
MCU
XTAL
CMOS Compatible
External Oscillator
(VDDPLL Level)
Not Connected
Figure 12-4. External Clock Connections (FSP mode selected)
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
501
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