Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)
Rev. 4.00 Mar. 15, 2006 Page 319 of 556
REJ09B0026-0400
15.4 Message Data and Control
Each Mailbox has a storage area for control information and transmitted or received.
15.4.1 Message Control (MCn0, MCn4 to MCn7 [n = 0 to 3])
The message control configures the arbitration field and control field of the data frames and
remote frames. The bit names in MCn0 and MCn4 to MCn7 correspond to the bit names of each
frame. Since the MCn0 and MCn4 to MCn7 (n = 0 to 3) are in RAM, the initial values are
undefined after power-on. Be sure to initialize these bits by writing 0 or 1.
SOF
Standard
format
Extended
format
ID28 ID18 RTR IDE R0 DLC
SOF ID18 SSR IDE ID0 RTR R1 R0
DLC
(Standard ID)
(Standard ID)
Arbitration field Data field or CRC field
Data field or CRC field
(R0 and R1 bits are reserved)
Control field
Control field
Arbitration field
(Extended ID)
ID27
ID28
ID27
ID17
ID16
• • •
• • • • • •
Figure 15.2 Standard Format and Extended Format