H836057 Datasheet, PDF (352/592 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 15 Controller Area Network for Tiny (TinyCAN)
Register
Name
Bit
MCn[0]
7
(n = 0 to 3)
Bit Name R/W
DART
R/W
6
NMC
R/W
5, 4 —
—
3 to 0 DLC3 to R/W
DLC0
MCn[4]
7 to 5 ID20 to
R/W
(n = 0 to 3)
ID18
Description
Automatic Retransmission Disable
When this bit is set to 1,the message disables to be
retransmitted in the event of an error on CAN bus or
an arbitration lost on CAN bus.
0: Automatic retransmission is carried out
1: Automatic retransmission is prohibited
New Message Control
When a Mailbox with an unread message receives a
new message, this bit selects whether to overrun or
overwrite the unread message with the new message.
0: The new receive message is ignored and the
unread message is saved, and the corresponding
UMSR bit is set to 1 (overrun)
1: The unread message is lost by being overwritten
with the new receive message, and the
corresponding UMSR bit is set to 1 (overwrite)
Reserved
These bits are always read as 0.
Data Length Code
These bits set the transmit data length of data frames
and data length requested by remote frames. These
bits are stipulated in Bosch 2.0B active.
0000: 0 bytes
0001: 1 byte
0010: 2 bytes
0011: 3 bytes
0100: 4 bytes
0101: 5 bytes
0110: 6 bytes
0111: 7 bytes
1xxx: 8 bytes
These bits set bits 2 to 0 in the standard identifier of
data frames and remote frames.
Rev. 4.00 Mar. 15, 2006 Page 320 of 556
REJ09B0026-0400