mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 197

• Manufacturer Part Number: mfr4200
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

3.8
A continuous external 4/10 MHz output clock signal is provided by the CC on the CLKOUT pin. This
signal is always active after power-up of the CC in all CC states including the hard reset state. The
CLKOUT signal is disabled during the internal power-on and low voltage reset procedures (refer to
Chapter 5, “Clocks and Reset
The output frequency of the CLKOUT signal is selected by the CLK_S0, CLK_S1 input pins, in
accordance with
3.9
3.9.1
Protocol Operation Control: Initiate hardware state.
During this state, the CC initializes all internal registers to their specified hard reset default state (see
Section 3.2.2, “Register Map
In the hard reset state:
The CC enters the hard reset state:
Freescale Semiconductor
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•
•
•
•
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All the operation with protocol state machine are stopped.
There is no transmission or reception on the FlexRay bus.
There is no clock synchronization running.
The CC host interface is stopped.
The CC analyzes the input signals on the two pins IF_SEL0 and IF_SEL1 while leaving the hard
reset state to configure the interface for the type of MCU (see
Interfaces”).
According to the state of the hard reset pin (see
Control”).
External 4/10 MHz Output Clock
Communication Controller States
Hard Reset State
For information on CLKOUT stabilization timing parameters, refer to
Appendix A, “Electrical
Table
3-22.
CLK_S0
0
1
0
1
Summary”).
Generator” for more information).
Table 3-22. CLKOUT Frequency Selection
Pin
CLK_S1
Characteristics”.
MFR4200 Data Sheet, Rev. 0
0
0
1
1
NOTE
Disabled (CLKOUT output is “0“)
Section 5.2.2, “Reset Generation and CLKOUT
CLKOUT Function
10 MHz output
40 MHz output
4 MHz output
Section 3.7, “Host Controller
External 4/10 MHz Output Clock
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