mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 46

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

Device Overview
The output frequency of the CLKOUT signal is selected by the CLK_S[1:0] input pins, in accordance with
Table
2.6.2
The MFR4300 can be connected and controlled by two types of interface through the CC EBI. Two pins,
IF_SEL0 and IF_SEL1, are used to configure the interface type, in accordance with
The CC latches the values of the IF_SEL0 and IF_SEL1 signals, when it leaves an internal or external reset
state, and analyzes them in order to configure the interface for the type of external host. The CC does not
analyze them after it has left the reset state. For more information on the internal and external reset states,
see
46
Chapter 6, “Clocks and Reset Generator
2-5:
External Host Interface Selection
As the CLK_S[1:0] signals are multiplexed with DBG[2:3], CLKOUT
should be selected using pullup and pulldown resistors
If the CC senses the Reserved mode on its IF_SEL pins (IF_SEL[1:0] = 00),
it stops all internal operations, does not perform or respond to any host
transactions, stays in the configuration mode, and does not integrate into the
communication process.
The following steps must be taken to select a correct external host interface
mode:
1.Set IF_SEL0, IF_SEL1 for either the AMI or the HCS12 synchronous mode.
IF_SEL0
0
0
1
1
CLK_S0
Pin
0
1
0
1
IF_SEL1
Table 2-5. CLKOUT Frequency Selection
Pin
0
1
0
1
CLK_S1
Table 2-6. Interface Selection
MFR4300 Data Sheet, Rev. 3
0
0
1
1
Reserved
HCS12 Synchronous Interface
Asynchronous Memory Interface
Asynchronous Memory Interface
(CRG)”.
NOTE
NOTE
Disabled (CLKOUT output is “0“)
Interface
CLKOUT Function
10 MHz output
40 MHz output
4 MHz output
CLK_CC
CLK_CC
CLK_CC
CHICLK_CC
Interface Clock
CHI and Host
Freescale Semiconductor
Table
2-6.