M32C83T datasheet(359/527 Pages) RENESAS

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Page 336

22. CAN Module

)

(

22.1.7 CAN0 Time Stamp Register (C0TSR Register)

CAN0 Time Stamp Register

Symbol

Address

After reset(1)

C0TSR

020916 - 020816

000016

Function

Value of Time Stamp

b15

NOTES:

1. Value is obtained by setting the SLEEP bit in the C0SLPR register to "1" (sleep mode exited) and

supplying a clock to the CAN module after reset.

Figure 22.9 C0TSR Register

The C0TSR register is a 16-bit counter. The TSPRE0 and TSPRE1 bits in the C0CTLR0 register

select the CAN bus bit clock divided by 1, 2, 3 or 4 as the count source for the C0TSR register.

When data transmission or reception is completed, the value of the C0TSR register is automatically

stored into the message slot.

The C0TSR register starts a counter increment when the RESET0 and RESET1 bits in the C0CTLR0

The C0TSR register is set to "000016":

• at the next count timing after the C0TSR register is set to "FFFF16";

• when the RESET0 and RESET1 bits are set to "1" (CAN module reset) by program, or

• when the TSRESET bit is set to "1" (C0TSR register reset) by program.

In loopback mode, when either data frame receive message slot or remote frame receive message

slot is available to store the message, the value of the C0TSR register is also stored into the mes-

sage slot when data reception is completed. The value of the C0TSR register is not stored when data

transmission is completed.

22.1.8 CAN0 Transmit Error Count Register (C0TEC Register)

Figure 22.10 C0TEC Register

In an error active or an error passive state, the count value of a transmission error is stored into the

C0TEC register. The counter is decremented when the CAN module has transmitted data as ex-

pected or is incremented when an transmit error occurs.

In a bus-off state, an indeterminate value is stored into the C0TEC register. The C0TEC register is

set to "0016" when the CAN module is placed in an error active state again.

CAN0 Transmit Error Count Register

Symbol

Address

After Reset(1)

C0TEC

020A16

0016

Function

Counter Value of Transmit Errors

NTOES:

1. Value is obtained by setting the SLEEP bit in the C0SLPR register to "1" (sleep mode exited) and

supplying a clock to the CAN module after reset.

M32C83T Datasheet(PDF) 359 Page - Renesas Technology Corp

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