M32CSLASH86 datasheet(359/505 Pages) RENESAS

359 / 505 page

Page 336

23. CAN Module

)

(

CANi Error Interrupt Status Register (i=0, 1)

Symbol

Address

After Reset(1)

C0EISTR

021516

XXXX X0002

C1EISTR

029516

XXXX X0002

BOIS

EPIS

BEIS

(b7 - b3)

Bus-Off Interrupt

Status Bit(2)

Error-Passive Interrupt

Status Bit(2)

CAN Bus-Error Interrupt

Status Bit(2)

0: No interrupt is requested

1: Interrupt is requested

0: No interrupt is requested

1: Interrupt is requested

0: No interrupt is requested

1: Interrupt is requested

Bit Name

Function

Bit

Symbol

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

NOTES:

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

reset and supplying the clock to the CAN module.

2. Set to "0" by program. When it is set to "1", the value before setting to "1" remains.

23.1.14 CANi Error Interrupt Status Register (CiEISTR Register) (i=0, 1)

Figure 23.16 C0EISTR and C1EISTR Registers

When using the CAN interrupt, the CiEISTR register indicates the source of the generated error inter-

rupt. The BOIS, EPIS and BEIS bits are not automatically set to "0" (no interrupt requested) even if an

interrupt is acknowledged. Set these bits to "0" by program.

Use the MOV instruction, instead of the bit clear instruction, to set each bit in the CiEISTR register to "0".

Bits not being changed to "0" must be set to "1".

For example: To set the BOIS bit for CAN0 to "0"

Assembly language:

mov.b#006h, C0EISTR

C language:

c0eistr = 0x06;

Refer to 23.4 CAN Interrupt for details.

23.1.14.1 BOIS Bit

The BOIS bit is set to "1" when the CAN module is placed in a bus-off state.

23.1.14.2 EPIS Bit

The EPIS bit is set to "1" when the CAN module is placed in an error passive state.

23.1.14.3 BEIS Bit

The BEIS bit is set to "1" when a CAN bus error is detected.

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