Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 320 of 556
REJ09B0026-0400
Register
Name Bit Bit Name R/W Description
7 DART R/W 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
6 NMC R/W 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)
5, 4 — — Reserved
These bits are always read as 0.
MCn[0]
(n = 0 to 3)
3 to 0 DLC3 to
DLC0
R/W 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
MCn[4]
(n = 0 to 3)
7 to 5 ID20 to
ID18
R/W These bits set bits 2 to 0 in the standard identifier of
data frames and remote frames.