H836057 Datasheet, PDF (367/592 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 15 Controller Area Network for Tiny (TinyCAN)
HRXD
Bus idle
Message 1
SOF
.....
[4] Error frame detection
Error Flag
Error Flag
Delimiter
Intermission
Message 2
SOF
HTXD
Bus idle
Message 1
SOF
.....
[4] Error frame detection
Error Flag
Error Flag
Delimiter
Message 2
TXPR.MBn
[4] Clear MBn in TXPR
TXCR.MBn
DART
ABACK.MBn
TCIRR.EMPI
TXACK.MBn
[5] Overwrite DART when other Mailbox has
transmit request
[4] Set MBn in ABACK and EMPI in TCIRR1
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)
Transmission for message 2
cannot be cancelled by TXCR
Internal arbitration for message 3
can be configurable
[2] Set MBn [3] Load DART when message 1
in TXPR is transferred to temporary buffer
[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
Figure 15.13 Internal Arbitration at Error Detection (DART = 1)
Rev. 4.00 Mar. 15, 2006 Page 335 of 556
REJ09B0026-0400