MAC7200 datasheet(592/976 Pages) FREESCALE

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The Generic FlexCAN2 Module

MAC7200 Microcontroller Family Reference Manual, Rev. 2

514

Freescale Semiconductor

28.2.6.3

The FlexCAN registers are described in this section in ascending address order.

28.2.6.3.1

Module Configuration Register (MCR)

This register defines global system configurations, such as the module operation mode (e.g., low power)

and maximum message buffer configuration. Most of the fields in this register can be accessed at any time,

except the MAXMB field, which should only be changed while the module is in Freeze Mode.

1010

Transmit a data frame whenever a remote request frame with the same ID

is received. This MB participates simultaneously in both the matching and

arbitration processes. The matching process compares the ID of the

incoming remote request frame with the ID of the MB. If a match occurs

this MB is allowed to participate in the current arbitration process and the

Code field is automatically updated to ‘1110’ to allow the MB to participate

in future arbitration runs. When the frame is eventually transmitted

successfully, the Code automatically returns to ‘1010’ to restart the

process again.

1110

1010

This is an intermediate code that is automatically written to the MB by the

MBM as a result of match to a remote request frame. The data frame will

be transmitted unconditionally once and then the code will automatically

return to ‘1010’. The CPU can also write this code with the same effect.

Address: Base + $0000

MDIS

FRZ

HALT

SUPV

DOZE

BCC

Reset

–1

101100

–2

100

–3

000

9876543

0000000000

MAXMB

Reset

0000000000001

1 Reset value of this bit is different on various platforms. Consult the specific MCU documentation to determine its

value.

2 Different on various platforms, but it is always the opposite of the MDIS reset value.

3 Different on various platforms, but it is always the same as the MDIS reset value.

Figure 28-3. Module Configuration Register (MCR)

Table 28-8. Message Buffer Code for Tx buffers

RTR

Initial Tx code

Code after

successful

transmission

Description

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