mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 121

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

EXTAL input frequency. In full stop mode (PSTP = 0), the EXTAL pin is pulled down by an internal
resistor of typical 200 k .
Freescale Semiconductor
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.
Full swing Pierce circuit is not suited for overtone resonators and crystals
without a careful component selection.
Figure 3-2. Loop Controlled Pierce Oscillator Connections (XCLKS = 1)
Figure 3-3. Full Swing Pierce Oscillator Connections (XCLKS = 0)
* R
MCU
Refer to manufacturer’s data.
Figure 3-4. External Clock Connections (XCLKS = 0)
s
EXTAL
can be zero (shorted) when use with higher frequency crystals.
XTAL
MCU
MCU
EXTAL
EXTAL
MC9S12XDP512 Data Sheet, Rev. 2.17
XTAL
XTAL
RS*
RB
Not Connected
NOTE
NOTE
Ceramic Resonator
Crystal or
CMOS Compatible
External Oscillator
Ceramic Resonator
(V
C1
C2
DDPLL
Crystal or
C1
C2
Level)
V
SSPLL
Chapter 3 Pierce Oscillator (S12XOSCLCPV1)
V
SSPLL
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