M32CSLASH86 datasheet(373/505 Pages) RENESAS

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Page 350

23. CAN Module

)

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Table 23.4 CiMCTLj register(i=0,1, j= 0 to 15) Settings and Transmit/Receive Mode

Settings for the CiMCTLj Register

TRMREQ RECREQ REMOTE RSPLOCK REMACTIVE MSGLOST TRMACTIVE SENTDATA

Transmit/Receive Mode

INVALDATA NEWDATA

No frame is transmitted or received

Data frame is received

Remote frame is received

(The data frame is transmitted

after receiving the remote frame.)

Data frame is transmitted

Remote frame is transmitted

(The data frame is received after

transmitting the remote frame)

23.1.20.1 SENTDATA/NEWDATA Bit

The SENTDATA/NEWDATA bit indicates that the CAN module has transmitted or received the CAN

message. Set the SENTDATA/NEWDATA bit to "0 " (not transmitted or not received) by program

before data transmission and reception is started. The SENTDATA/NEWDATA bit is not set to "0"

automatically. When the TRMACTIVE/INVALDATA bit is set to "1" (during transmission or storing

received data), the SENTDATA/NEWDATA bit cannot be set to "0".

SENTDATA :

The SENTDATA bit is set to "1" (transmit complete) when data transmission is com-

pleted in the transmit message slot.

NEWDATA :

The NEWDATA bit is set to "1" (receive complete) when the message to be stored

into the message slot j (j=0 to 15) is received in the receive message slot as ex-

pected.

NOTES:

1. To read a received data from the message slot j, set the NEWDATA bit to "0" before reading. If

the NEWDATA bit is set to "1" immediately after reading, this indicates that new received data

has been stored into the message slot while reading and the read data contains an indetermi-

nate value. In this case, discard the data with indeterminate value and then read the message

slot again after the NEWDATA bit is set to "0".

2. When the remote frame is transmitted or received, the SENTDATA/NEWDATA bit remains

unchanged after the remote frame transmission or reception is completed. The SENTDATA/

NEWDATA bit is set to "1" when a subsequent data frame transmission or reception is com-

pleted.

23.1.20.2 TRMACTIVE/INVALDATA Bit

The TRMACTIVE/INVALDATA bit indicates that the CAN protcol controller is transmitting or receiving

a message and accessing the message slot j. The TRMACTIVE/INVALDATA bit is set to "1" when the

CAN module is accessing the message slot and to "0 " when not accessing the message slot.

TRMACTIVE : The TRMACTIVE bit is set to "1" (except transmitting) when a data transmission is

started in the message slot. If the CAN module loses in bus arbitration, the

TRMACTIVE bit is set to "0" (stops transmitting) when a CAN bus error occurs or

when a data transmission is completed.

INVALDATA :

The INVALDATA bit is set to "1" (storing received data) when receiving a received

message into the messaqe slot j, after a message reception is completed. Then the

INVALDATA bit is set to "0" after a message storage is completed. Data, if read

from the message slot j while this bit is set to "1", is indeterminate.

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