mm912f634 Freescale Semiconductor, Inc, mm912f634 Datasheet - Page 254
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mm912f634
Manufacturer Part Number
mm912f634
Description
Mm912f634 - Integrated S12 Based Relay Driver With Lin
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MM912F634.pdf
(335 pages)
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Functional Description and Application Information
4.33.5
EXTAL is the input to the crystal oscillator amplifier. XTAL is the output of the crystal oscillator amplifier.
The circuit shown in
If S12SCRG is not used, it is recommended to pull the EXTAL input pin to GND, as shown in
output will be forced to V
Freescale Semiconductor
External Signals EXTAL and XTAL — Input and Output Pins
Freescale recommends an evaluation of the application board, and chosen resonator or
crystal, by the resonator or crystal supplier.
The oscillator circuit is not suited for overtone resonators and crystals.
Figure 79
DD
by the MCU.
* R
is recommended when using either a crystal or a ceramic resonator.
MCU
Refer to manufacturer’s data.
Figure 80. External Connections, if S12SCRG is Unused
s
EXTAL
can be zero (shorted) when use with higher frequency crystals.
Figure 79. Full Swing Pierce Oscillator Connections
XTAL
RS*
MCU
RB
EXTAL
XTAL
NOTE
Do not connect
Ceramic Resonator
Crystal or
C1
C2
External Oscillator (S12SS12SCRGV1)
Figure
80. In Off mode the XTAL
MM912F634
254
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