SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
Entering clock stop mode is controlled by the input clock stop request signal or MCAN_CCCR.CSR bit. As long as the clock stop request signal is active, the MCAN_CCCR.CSR bit is read as 1. When all pending transmission requests have completed, the MCAN module waits until bus idle state is detected. Then the MCAN module sets the MCAN_CCCR.INIT to 1 to prevent any further CAN transfers. The MCAN module acknowledges that the module is ready for power down by setting the output clock stop acknowledge signal to 1 and the MCAN_CCCR.CSA bit to 1. In this state, before the clocks are switched off, further register accesses can be made. A write access to the MCAN_CCCR.INIT bit has no effect. Now the module clock inputs MCAN_ICLK and MCAN_FCLK can be switched off.
To leave power-down mode, the application has to turn on the module clocks before resetting the input clock stop request signal respectively the MCAN_CCCR.CSR flag bit. The MCAN acknowledges this by resetting the output clock stop acknowledge signal respectively the MCAN_CCCR.CSA flag bit. Afterwards, the application can restart CAN communication by resetting the MCAN_CCCR.INIT bit.
Restoring the clocks from clock stop mode needs to be done according to how the clock stop was initiated.
The MCAN module supports two external clock stop modes:
In a graceful clock stop mode when the clock stop request is asserted, the MCAN core responds with a clock stop acknowledge when all pending Tx messages have been processed and an Idle line had been detected. The MCAN_CCCR.INIT bit is set, the MCAN core goes and stays Idle.
The automatic wakeup feature is enabled by setting the MCANSS_CTRL.AUTOWAKEUP and MCANSS_CTRL.WAKEUPREQEN bits to 1 (for more information, see Section 35.5.8.2). When an external clock stop request is removed and no suspend request is active, a read-modify-write to the MCAN_CCCR.INIT bit is performed to clear the bit.