32186 datasheet(647/1032 Pages) RENESAS

647 / 1032 page

CAN MODULE

13-37

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

13.2.8 CAN Interrupt Related Registers

The CAN interrupt related registers are used to control the interrupt request signals output to the Interrupt Con-

troller by CAN.

The CAN interrupt request is of 3 types as follows:

• CAN transmit/receive completion interrupt request

• CAN error interrupt request

• CAN single-shot interrupt request

These combined interrupt requests corresponds to CAN transmit/receive & error interrupt request.

Figure 13.2.4 Interrupt Request Status and Mask Registers

To the Interrupt Controller

Interrupt request from

each peripheral function

Interrupt request status

Data bus

Set

• Group interrupt

Interrupt request enable

clear

F/F

Data = 0

(1) Interrupt request status bit

This status bit is used to determine whether an interrupt is requested. When an interrupt request occurs, this

bit is set in hardware (cannot be set in software). The status bit is cleared by writing "0." Writing "1" has no

effect; the bit retains the status it had before the write. Because this bit is unaffected by the interrupt request

mask bit, it can also be used to inspect the operating status of peripheral functions. In interrupt handling,

make sure that within the grouped interrupt request status, only the status bit for the interrupt request that

has been serviced is cleared. If the status bit for any interrupt request that has not been serviced is cleared,

the pending interrupt request is cleared simultaneously with its status bit.

(2) Interrupt request mask bit

This bit is used to disable unnecessary interrupt requests within the grouped interrupt request. Set this bit to

"1" to enable interrupt requests or "0" to disable interrupt requests.

Figure 13.2.3 Block Diagram of the CAN interrupt requests

CAN transmit/receive & error interrupt request

CAN transmit/receive completion interrupt request

CAN single-shot interrupt request

CAN error interrupt request

13.2 CAN Module Related Registers

32186 Datasheet(PDF) 647 Page - Renesas Technology Corp