M16CSLASH29 datasheet(332/499 Pages) RENESAS

332 / 499 page

17. CAN Module

page 308

17.7 Return from Bus off Function

When the protocol controller enters bus off state, it is possible to make it forced return from bus off state by

setting the RetBusOff bit in the C0CTLR register to 1 (Force return from bus off). At this time, the error state

changes from bus off state to error active state. If the RetBusOff bit is set to 1, registers C0RECR and

C0TECR are initialized and the State_Reset bit in the C0STR register is set to 0 (The CAN module is not in

error bus off state). However, registers of the CAN module such as C0CONR register and the content of

each slot are not initialized.

17.8 Time Stamp Counter and Time Stamp Function

When the C0TSR register is read, the value of the time stamp counter at the moment is read. The period of

the time stamp counter reference clock is the same as that of 1 bit time that is configured by the C0CONR

The 1 bit time period can be divided by 1 (undivided), 2, 4 or 8 to produce the time stamp counter reference

clock. Use the TSPreScale bit in the C0CTLR register to select the divide-by-n value.

The time stamp counter is equipped with a register that captures the counter value when the protocol

controller regards it as a successful reception. The captured value is stored when a time stamp value is

stored in a reception slot.

17.9 Listen-Only Mode

When the RXOnly bit in the C0CTLR register is set to 1, the module enters listen-only mode.

In listen-only mode, no transmission -- data frames, error frames, and ACK response -- is performed to bus.

When listen-only mode is selected, do not request the transmission.

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