Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 334 of 556
REJ09B0026-0400
HRXD
SOF Error flag
Error flag
delimiter
Error flag
delimiter
Intermission
SOF
SOF Error flag
[4] Clear MBn in TXPR and MBn in TXCR
[4] Set MBn in ABACK and EMPI in TCIRR1
HTXD
MBn in TXPR
MBn in TXCR
EMPI in TCIRR1
MBn in ABACK
DART
MBn in TXACK
Bus idle
Message 1
[4] Error frame detection
[4] Error frame detection
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
[5] Internal arbitration for message 2 is determined
after error frame has ended
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 MBn
in TXPR
Internal arbitration for message 2 can be configurable
(Transmission settings can be changed by TXPR/TXCR)
Message 1
Message 2
Message 2
Bus idle
. . . . .
. . . . .
Figure 15.12 Internal Arbitration at Error Detection (MBn in TXCR = 1)