32186 datasheet(679/1032 Pages) RENESAS

679 / 1032 page

CAN MODULE

13-69

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

13.2.11 CAN DMA Transfer Request Select Registers

CAN0 DMA Transfer Request Select Register (CAN0DMARQ)

<Address: H’0080 1019>

CAN1 DMA Transfer Request Select Register (CAN1DMARQ)

<Address: H’0080 1419>

b15

CDMSEL1 CDMSEL0

Bit Name

Function

8–13

No function assigned. Fix to "0."

CDMSEL1

0: Slot 1 transmission failed

CAN DMA1 transfer request source select bit

1: Slot 30 transmission/reception completed

CDMSEL0

0: Slot 0 transmission failed

CAN DMA0 transfer request source select bit

1: Slot 31 transmission/reception completed

CAN0 and 1 can generate DMA transfer requests. This register is used to select the cause or source of that request.

(1) CDMSEL1 (CAN DMA1 Transfer Request Source Select) bit (Bit 14)

CAN0 and CAN1 allow DMA2 & DMA7 and DMA7 & DMA9 to generate DMA transfer requests, respectively.

This bit selects one of the following two as the cause or source of a transfer request.

• Slot 1 transmission failed

If the CDMSEL1 bit is set to "0," a transfer request is generated when transmission in slot 1 has failed

for reasons of arbitration-lost or transmit error.

• Slot 30 transmission/reception completed

If the CDMSEL1 bit is set to "1," a transfer request is generated when transmission/reception in slot 30

is completed.

Notes: • If slot 30 has been set for remote frame transmission, a DMA transfer request is gener

ated when remote frame transmission is completed as well as when data frame recep-

tion is completed.

• If slot 30 has been set for remote frame reception (automatic response), a DMA transfer

request is generated when remote frame reception is completed as well as when data

frame transmission is completed.

(2) CDMSEL0 (CAN DMA0 Transfer Request Source Select) bit (Bit 15)

CAN0 and CAN1 allow DMA0 & DMA6 and DMA5 & DMA8 to generate DMA transfer requests, respectively.

This bit selects one of the following two as the cause or source of a transfer request.

• Slot 0 transmission failed

If the CDMSEL0 bit is set to "0," a transfer request is generated when transmission in slot 0 has failed

for reasons of arbitration-lost or transmit error.

• Slot 31 transmission/reception completed

If the CDMSEL0 bit is set to "1," a transfer request is generated when transmission/reception in slot 31

is completed.

Notes: • If slot 31 has been set for remote frame transmission, a DMA transfer request is gener

ated when remote frame transmission is completed as well as when data frame reception

is completed.

• If slot 31 has been set for remote frame reception (automatic response), a DMA transfer

request is generated when remote frame reception is completed as well as when data

frame transmission is completed.

13.2 CAN Module Related Registers

32186 Datasheet(PDF) 679 Page - Renesas Technology Corp

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