MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 465

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

Freescale Semiconductor
Bits
2–0
7
6
5
4
3
PROPSEG Propagation segment. Defines the length of the propagation segment in the bit time. The
BOFFREC Bus off recovery mode. Defines how FlexCAN recovers from bus off state. If this bit is
Name
TSYN
LBUF
SMP
LOM
Table 21-3. CANCTRLn Field Descriptions (Continued)
Sampling mode. Determines whether the FlexCAN module will sample each received bit
one time or three times to determine its value.
0 One sample, taken at the end of phase buffer segment 1, is used to determine the value
1 Three samples are used to determine the value of the received bit. The samples are
cleared, automatic recovering from bus off state occurs according to the CAN Specification
2.0B. If the bit is set, automatic recovering from bus off is disabled and the module remains
in bus off state until the bit is cleared by the user. If the bit is cleared before 128 sequences
of 11 recessive bits are detected on the CAN bus, then bus off recovery happens as if the
BOFFREC bit had never been set. If the bit is cleared after 128 sequences of 11 recessive
bits occurred, then FlexCAN will re-synchronize to the bus by waiting for 11 recessive bits
before joining the bus. After clearing, the BOFFREC bit can be set again during bus off, but
it will only be effective the next time the module enters bus off. If BOFFREC was cleared
when the module entered bus off, setting it during bus off will not be effective for the current
bus off recovery.
0 Automatic recovering from bus off state enabled, according to CAN Spec 2.0B
1 Automatic recovering from bus off state disabled
Timer synchronize mode. Enables the mechanism that resets the free-running timer each
time a message is received in Message Buffer 0. This feature provides the means to
synchronize multiple FlexCAN stations with a special “SYNC” message (global network
time).
0 Timer synchronization disabled.
1 Timer synchronization enabled.
Note: There can be a bit clock skew of four to five counts between different FlexCAN
modules that are using this feature on the same network.
Lowest buffer transmitted first. Defines the ordering mechanism for message buffer
transmission.
0 Message buffer with lowest ID is transmitted first
1 Lowest numbered buffer is transmitted first
Listen-only mode. Configures FlexCAN to operate in listen-only mode. In this mode
transmission is disabled, all error counters are frozen, and the module operates in a CAN
error passive mode. Only messages acknowledged by another CAN station will be
received. If FlexCAN detects a message that has not been acknowledged, it will flag a BIT0
error (without changing the REC), as if it was trying to acknowledge the message.
0 FlexCAN module is in normal active operation; listen-only mode is deactivated
1 FlexCAN module is in listen-only mode operation
valid programmable values are 0–7.
Note: A time-quantum = 1 S clock period.
of the received bit.
taken at the normal sample point and at the two preceding periods of the S-clock; a
majority rule is used.
MCF5235 Reference Manual, Rev. 2
Propagation segment time
Description
=
(PROPSEG + 1) time-quanta
Memory Map/Register Definition
21-11