Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 331 of 556
REJ09B0026-0400
HRXD
Bus idle
Message 1 Message 2
Message 2
[4] Arbitration loss
[4] Clear MBn in TXPR and MBn in TXCR for message 1
[4] Set MBn in ABACK and EMPI in TCIRR1 for message 1
Transmission for message 1
cannot be cancelled by TXCR
Transmission for message 2
cannot be cancelled by TXCR
Internal arbitration for message 3
can be configurable
Internal arbitration for message 2 can be configurable
(Transmission settings can be changed by TXPR/TXCR)
[5] Internal arbitration for message 2
is determined after normal reception
has completed
If other Mailbox has a transmit
request, transmission is started at this
timing
[3] Set MBn in TXCR after internal arbitration
for message 1 has been determined
[2] Set TXPR
Message 1 reception
Bus idle
HTXD
MBn in TXPR
MBn in TXCR
MBn in ABACK
DART
EMPI in TCIRR1
MBn in TXACK
SOF Arbitration Control Data CRC ACK EOF
Intermission
SOF
SOF Arbitration
ACK bit
Figure 15.9 Internal Arbitration at Reception Caused by CAN Bus Arbitration Loss
(MBn in TXCR = 1)