32186 datasheet(736/1032 Pages) RENESAS

736 / 1032 page

CAN MODULE

13-126

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

B'0100 0011

B'0000 0001

B'0100 0001

B'0000 0000

B'0100 0000

Clear the receive request

Write H'40

Start storing the received data

Clear the receive

request

Store

the

received

data

Clear

the

rec

eive

quest

Finished storing the received data

Finished

storing

the

received

data

Clear

the

receive

request

B'0000 0011

B'0100 0111

Start storing the received data

(Message lost occurs)

B'0100 0101

Finished storing

the received

data

B'0000 0111

B'0000 0101

Start store the received data

(Message lost occurs)

Wait for the

received data

Wait for the received data

Finished storing

the received data

Clear the receive

request

Clear the receive

request

Clear the receive

request

Finished storing

the received data

Store

the

received

data

Clear

the

rec

eive

quest

Finished

storing

the

received

data

Clear

the

receive

request

b7 (b15)

(b8)

TRSTAT TRFIN

00000000

CAN message slot control register bit allocation

CPU read & TRFIN bit clear

B'0100 0111

Figure 13.6.2 Operation of CAN Message Slot Control Register during Data Frame Reception

13.6 Receiving Data Frames

(2) When the receive conditions are met

When the receive conditions in (1) above are met, the CAN module sets the CAN Message Slot Control

the same time writing the received data to the message slot. If the TRFIN (Transmit/Receive Finished) bit is

already set to "1" at this time, the CAN module also sets the ML (Message Lost) bit to "1," indicating that the

message slot has been overwritten. The message slot has both of its ID and DLC fields entirely overwritten

and has an undefined value written in its unused area (e.g., extended ID field during standard frame recep-

tion and an unused data field).

Furthermore, a timestamp count value at which the message was received is written to the CAN Message

Slot Timestamp (C0MSLnTSP, C1MSLnTSP) along with the received data. When the CAN module finished

writing to the message slot, it sets the CAN Slot Interrupt Request Status bit to "1." If the interrupt request for

the slot has been enabled, the CAN module generates an interrupt request and enters a wait state for the

next reception.

(3) When the receive conditions are not met

The received frame is discarded, and the CAN module goes to the next transmit/receive operation without

writing to the message slot.

32186 Datasheet(PDF) 736 Page - Renesas Technology Corp

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