mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 47

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

2.4.4
The CC provides a continuous external output clock signal on the CLKOUT pin; this signal can be either
disabled or set to a frequency of 4, 10, or 40 MHz. The signal is always active after the 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
Section A.2.2, “Chip Power-up and Voltage
Figure
select its output frequency in accordance with the
Figure 2-6
Refer to
Freescale Semiconductor
CLKOUT divider internal reset
the divider is based on a counter
CLKOUT divider/counter output
2-8) for more information). The CLK_S[1:0] input pins enable/disable the CLKOUT signal and
Notes:
1
2
3
Internal CLK_S[1:0] latches
Chapter 5, “Clocks and Reset Generator
For more information on the POR, refer to
For more information on the t
For more information on the Internal Startup Counter, the Internal CLK_S[1:0] latches, and the CLKOUT
divider internal reset signals, refer to
Internal startup counter
and
External Output Clock
Figure 2-7
CLKOUT output
OSC clk output
Where:
POR
VDD
Figure 2-6. CLKOUT Generation During Power-on Reset
Counter starts counting
depict the CLKOUT generation during external hard reset and internal resets.
3
,
1
3
3
Counter maximum value
UPOSC
, refer to
MFR4200 Data Sheet, Rev. 0
Chapter 5, “Clocks and Reset
Drops”, and the figures below
A.2.2, “Chip Power-up and Voltage
Max. count value defined by
A.3, “Reset and
CLK_S[1:0] latched values
for more information.
Table
Chapter 5, “Clocks and Reset
0
2-2.
t
UPOSC
Latching window
Oscillator”.
~16000 µT
2
Generator.
Counter is reset
Counter does not count
~16000
Drops”.
(Figure
Generator”,
2-6,
Figure
Modes of Operation
2-7, and
47