mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 42

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

Device Overview
2.4.3.14 CHICLK_CC — External CHI Clock Input
CHICLK_CC is the selectable external CHI clock input. It can be selected to drive the Asynchronous
Memory Interface (see
2.4.3.15 CLKOUT — Clock Output
CLKOUT is a continuous clock output signal. The frequency of CLKOUT is selected by the CLK_S[1:0]
pins. The CLKOUT signal, if enabled, is always active:
The pin can be configured to provide either high or reduced output drive.
2.4.3.16 RESET# — External Reset
RESET# is an active-low control signal that acts as an input to initialize the CC to a known startup state.
2.4.3.17 INT_CC# — Interrupt Output
INT_CC# is an AMI and HCS12 interfaces interrupt request output signal. The CC may request a service
routine from the host to run. The interrupt is indicated by the logic level: the interrupt is asserted if the
INT_CC# outputs a logic 0 and is deasserted if INT_CC# outputs a logic 1.
The pin can be configured to provide either high or reduced output drive. This is an open-drain output.
2.4.3.18 TEST
The TEST pin is pulled down, internally, and must be tied to VSS in all applications.
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1. after power-up of the CC,
2. after a low-voltage reset,
3. after a clock monitor failure reset,
4. during and after an external hard reset.
While the IF_SEL[1:0] levels are being latched, the output drive control is
disabled, and the internal pulldown resistors are connected to the pins.
As IF_SEL[1:0] signals share pins with Physical Layer Interface signals,
pullup/pulldown devices must be used for the selection. Recommended
pullup/pulldown resistor values for the IF_SEL[1:0] inputs are given in
Section 2.6.3, “Recommended Pullup/pulldown Resistor
As the CLKOUT signal can be disabled during internal resets, refer to
Section 6.4.3, “CLKOUT Mode Selection and
information on CLKOUT generation during external hard and internal
resets.
Section 2.6.2, “External Host Interface
MFR4300 Data Sheet, Rev. 3
NOTE
Control” for more
Selection”).
Values”.
Freescale Semiconductor