Section 13 Controller Area Network (HCAN)
Rev. 3.00 Mar. 14, 2006 Page 478 of 804
REJ09B0104-0300
13.3.18 Message Control (MC0 to MC15)
The message control register sets consist of eight 8-bit registers for one mailbox. The HCAN has
16 sets of these registers. Because message control registers are in RAM, their initial values after
power-on are undefined. Be sure to initialize them by writing 0 or 1. Figure 13.2 shows the
register names for each mailbox.
MC0[1]
MC1[1]
MC2[1]
MC3[1]
MC15[1]
MC0[2]
MC1[2]
MC2[2]
MC3[2]
MC15[2]
MC0[3]
MC1[3]
MC2[3]
MC3[3]
MC15[3]
MC0[4]
MC1[4]
MC2[4]
MC3[4]
MC15[4]
MC0[5]
MC1[5]
MC2[5]
MC3[5]
MC15[5]
MC0[6]
MC1[6]
MC2[6]
MC3[6]
MC15[6]
MC0[7]
MC1[7]
MC2[7]
MC3[7]
MC15[7]
MC0[8]
MC1[8]
MC2[8]
MC3[8]
MC15[8]
Mail box 0
Mail box 1
Mail box 2
Mail box 3
Mail box 15
Figure 13.2 Message Control Register Configuration
The setting of message control registers are shown below. Figures 13.3 and 13.4 show the
correspondence between the identifiers and register bit names.
SOF
ID-28
ID-27
ID-18
RTR
IDE
R0
identifier
Figure 13.3 Standard Format
SOF
ID-28
ID-27
ID-18
SRR
IDE
ID-17
ID-16
ID-0
RTR
R1
Standard identifier
Extended identifier
Figure 13.4 Extended Format
electronic components distributor