• Ignores the Rx input pin and drives the Tx pin as recessive.
• Stops the prescaler, thus halting all CAN protocol activities.
• Grants write access to the Error Counters register, which is read-only in other modes.
• Sets MCR[NOTRDY] and MCR[FRZACK].
After requesting Freeze mode, the user must wait for MCR[FRZ_ACK] to be asserted
before executing any other action; otherwise FlexCAN may operate in an unpredictable
way. In Freeze mode, all memory-mapped registers are accessible, except for
CTRL1[CLKSRC], which can be read but cannot be written.
Exiting Freeze mode is done in one of the following ways:
• CPU negates MCR[FRZ].
• The chip is removed from Debug mode and/or the HALT bit is negated.
MCR[FRZ_ACK] is negated after the protocol engine recognizes the negation of the
freeze request. When out of Freeze mode, FlexCAN tries to resynchronize to the CAN
bus by waiting for 11 consecutive recessive bits.
49.5.11.2 Module Disable mode
This low-power mode is normally used to temporarily disable a complete FlexCAN
block, with no power consumption. It is requested by the CPU through the assertion of
MCR[MDIS], and the acknowledgement is obtained through the assertion by the
FlexCAN of MCR[LPMACK]. The CPU must only consider the FlexCAN in Disable
mode when both request and acknowledgement conditions are satisfied.
If the module is disabled during Freeze mode, it requests to disable the clocks to the PE
and CHI submodules, sets MCR[LPMACK] and negates MCR[FRZACK].
It is not recommended to use Module Disable mode under Pretended Networking mode.
Negate MCR[MDIS] and wait for MCR[LPMACK] to negate before setting
MCR[PNET_EN].
If the module is disabled during transmission or reception, FlexCAN does the following:
• Waits to be in either Idle or Bus Off state, or else waits for the third bit of
Intermission and then checks it to be recessive.
• Waits for all internal activities like arbitration, matching, move-in, and move-out to
finish. A pending move-in is not taken into account.
Functional description
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NXP Semiconductors
Содержание MWCT101 S Series
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