Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 322 of 556
REJ09B0026-0400
15.4.2 Local Acceptance Filter Mask (LAFMHn1, LAFMHn0, LAFMLn1, LAFMLn0
[n = 0 to 3])
LAFM consists of four registers for one Mailbox. LAFM filters mask of bit-unit comparison
between the message identifier of RXn (n = 0 to 3) stored in the receive Mailbox and the receive
message identifier. Since LAFM is in RAM, initial values are undefined after power-on. Be sure
to initialize each bit by writing 0 or 1.
Register
Name Bit Bit Name R/W Description
LAFMLn1
(n = 0 to 3)
7 to 0 LAFMLn7 to
LAFMLn0
R/W Filter mask for bits 7 to 0 of the extended identifier.
0: Receive message is stored in RXn because the
RXn message identifier bits match the receive
message identifier bits
1: Receive message is stored in RXn regardless of
whether the RXn message identifier bits match
the receive message identifier bits
LAFMLn0
(n = 0 to 3)
7 to 0 LAFMLn15 to
LAFMLn8
R/W Filter mask for bits 15 to 8 of the extended
identifier.
0: Receive message is stored in RXn because the
RXn message identifier bits match the receive
message identifier bits
1: Receive message is stored in RXn regardless of
whether the RXn message identifier bits match
the receive message identifier bits
LAFMHn1
(n = 0 to 3)
7 to 5 LAFMHn7 to
LAFMHn5
R/W Filter mask for bits 2 to 0 of the standard identifier.
0: Receive message is stored in RXn because the
RXn message identifier bits match the receive
message identifier bits
1: Receive message is stored in RXn regardless of
whether the RXn message identifier bits match
the receive message identifier bits