mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 43

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

2.4.3.19 DBG[3:2]/CLK_S[1:0] — Debug Strobe Points, Output Clock Select
DBG[3:2] are debug strobe point output signals. The functions output on these pins are selected by the
debug port control register. Refer to
2.4.3.20 EXTAL/CC_CLK — Crystal Driver, External Clock Pin
This pin can act as a crystal driver pin (EXTAL) or as an external clock input pin (CC_CLK). On reset, the
device clock is derived from the input frequency on this pin. Refer to
connections and
2.4.3.21 XTAL — Crystal Driver Pin
XTAL is a crystal driver pin. Refer to
clock connections. See also
Freescale Semiconductor
MFR4300
VDDOSC
VSSOSC
EXTAL
XTAL
CLK_S[1:0] signals are inputs during the internal reset sequence and are
latched during the internal reset sequence.
While the CLK_S[1:0] levels are being latched, the output drive control is
disabled, and the internal pulldown resistors are connected to the pins.
Figure 2-4
Rs
VSSOSC
Rb
for external clock connections. See also
Chapter 7, “Oscillator
C3
Q
Figure 2-3. Oscillator Connections
Section 3.4.16, “Strobe Signal Support”
Figure 2-3
C1
C2
MFR4300 Data Sheet, Rev. 3
VSSOSC
NOTE
for oscillator connections and
(OSCV2)”.
Where:
Oscillator supply output capacitor C3 = 220 nF
• Q = 40 MHz crystal
• Rb is in the range 1M – 10 M:
• Rs is a lower value, which can be 0 :
• C1 = C2
• See crystal manufacturer’s product specification for
recommended values
Chapter 7, “Oscillator
Figure 2-3
for more information.
Figure 2-4
for Pierce oscillator
for external
(OSCV2)”.
Device Overview
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