Preface
MPC5565 Microcontroller Reference Manual, Rev. 1.0
21-32
Freescale Semiconductor
Figure 21-15. Arbitration, Match and Move Time Windows
21.4.6
Modes of Operation Details
21.4.6.1
Freeze Mode
This mode is entered by asserting the HALT bit in the CAN
x
_MCR or when the MCU is put into debug
mode. In both cases it is also necessary that the FRZ bit is asserted in the CAN
x
_MCR. When freeze mode
is requested during transmission or reception, FlexCAN2 does the following:
•
Waits to be in either intermission, passive error, bus off or idle state
•
Waits for all internal activities like move in or move out to finish
•
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 CAN
x
_ECR, which is read-only in other modes
•
Sets the NOTRDY and FRZACK bits in CAN
x
_MCR
After requesting freeze mode, the user must wait for the FRZACK bit to be asserted in CAN
x
_MCR before
executing any other action, otherwise FlexCAN2 can operate in an unpredictable way. In freeze mode, all
memory mapped registers are accessible; CANx_RXIMR
n
registers can be programmed only if the
MBFEN bit is asserted.
Exiting freeze mode is done in one of the following ways:
•
CPU negates the FRZ bit in the CAN
x
_MCR.
•
The MCU exits debug mode and/or the HALT bit is negated.
After it is out of freeze mode, FlexCAN2 tries to re-synchronize to the CAN bus by waiting for 11
consecutive recessive bits.
21.4.6.2
Module Disabled Mode
This low power mode is entered when the CAN
x
_MCR[MDIS] bit is asserted. If the module is disabled
during freeze mode, it shuts down the clocks to the CPI and MBM sub-modules, sets the
CAN
x
_MCR[MDISACK] bit and negates the CAN
x
_MCR[FRZACK] bit.
CRC (15)
EOF (7)
Interim
Start move
Matching and arbitration window (24 bits)
Move
(bit 6)
window
Summary of Contents for MPC5565
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Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...