MAC7200 datasheet(587/976 Pages) FREESCALE

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The Generic FlexCAN2 Module

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

509

28.2.4.6

Doze Mode:

This low power mode is entered when the DOZE bit in MCR is asserted and Doze Mode is requested at

MCU level. When in Doze Mode, the module shuts down the clocks to the CAN Protocol Interface and

the Message Buffer Management sub-modules. Exit from this mode happens when the DOZE bit in MCR

is negated, when the MCU is removed from Doze Mode, or when activity is detected on the CAN bus and

the Self Wake Up mechanism is enabled. See Section 28.2.7.8.3, “Doze Mode,” for more information.

28.2.4.7

Stop Mode:

This low power mode is entered when Stop Mode is requested at MCU level. When in Stop Mode, the

module puts itself in an inactive state and then informs the CPU that the clocks can be shut down globally.

Exit from this mode happens when the Stop Mode request is removed or when activity is detected on the

CAN bus and the Self Wake Up mechanism is enabled. See Section 28.2.7.8.4, “Stop Mode,” for more

information.

28.2.5

External Signal Descriptions

The FlexCAN module has two I/O signals connected to the external MCU pins. These signals are

summarized in Table 28-3 and described in more detail in the next sub-sections.

28.2.5.1

CAN Rx

This pin is the receive pin from the CAN bus transceiver. Dominant state is represented by logic level ‘0’.

Recessive state is represented by logic level ‘1’.

28.2.5.2

CAN Tx

This pin is the transmit pin to the CAN bus transceiver. Dominant state is represented by logic level ‘0’.

Recessive state is represented by logic level ‘1’.

28.2.6

Memory Map and Register Definition

This section describes the registers and data structures in the FlexCAN module. The base address of the

module depends on the particular memory map of the MCU. The addresses presented here are relative to

the base address.

Table 28-3. FlexCAN Signals

Signal Name1

1. The actual MCU pins may have different names. Please consult Chapter 9, “Device

Memory Map” for the actual signal names.

Direction

Description

CAN Rx

Input

CAN Receive Pin

CAN Tx

Output

CAN Transmit Pin

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