HD64F36034 datasheet(362/592 Pages) RENESAS

362 / 592 page

Section 15 Controller Area Network for Tiny (TinyCAN)

Rev. 4.00 Mar. 15, 2006 Page 330 of 556

REJ09B0026-0400

4. If an arbitration loss occurs in the arbitration field, the TinyCAN starts reception. When the

DART or MBn bit in TXCR is set to 1, a transmit request for message 1 is canceled. At this

time, the MBn bits in TXPR and TXCR are cleared to 0 and the MBn bit in ABACK and the

EMPI bit in TCIRR1 are set to 1. The MBn bit in TXACK is always 0.

5. When there is a transmit request after reception has completed (for details, see section 15.5.4,

Message Reception), the arbitration for message 2 is determined and it is transmitted to the

CAN bus. When there is no transmit request, the TinyCAN starts reception.

HRXD

SOF

Bus idle

Arbitration

Control

Data

Message 1

[4] Arbitration loss

Transmission for message 1

cannot be cancelled by TXCR

Internal arbitration for message 2 can be configurable

(Transmission settings can be changed by TXPR/TXCR)

Message 1 reception

Transmission for message 2

cannot be cancelled by TXCR

Internal arbitration for message 3

can be configurable

[5] Internal arbitration for message 2

is determined after normal reception

has completed

[3] Internal arbitration for message 1

is determined

[2] Set TXPR

Message 2

CRC

ACK

EOF

Intermission

SOF

Arbitration

ACK bit

Intermission

SOF

HTXD

MBn in TXPR

MBn in TXCR

EMPI in TCIRR1

MBn in ABACK

DART

Figure 15.8 Internal Arbitration at Reception Caused by CAN Bus Arbitration Loss

(MBn in TXCR = 0 and DART = 0)

HD64F36034 Datasheet(PDF) 362 Page - Renesas Technology Corp

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