M32C83T datasheet(365/527 Pages) RENESAS

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Page 342

22. CAN Module

)

(

CAN0 Error Interrupt Status Register

Symbol

Address

After Reset(1)

C0EISTR

021516

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 C0SLPR register to "1" (sleep mode exited) and

supplying the clock to the CAN module after reset.

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

22.1.14 CAN0 Error Interrupt Status Register (C0EISTR Register)

Figure 22.16 C0EISTR Register

When using the CAN interrupt, the C0EISTR register indicates the cause 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(1).

Refer to 22.3 CAN Interrupt for details.

22.1.14.1 BOIS Bit

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

22.1.14.2 EPIS Bit

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

22.1.14.3 BEIS Bit

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

NOTES:

1. Use the MOV instruction, instead of the bit clear instruction, to set each bit in the CoEISTR register

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

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

Assembly language:

mov.b#006h, C0EISTR

C language:

c0eistr = 0x06;

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