Oki MSM9225B, User Manual

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MSM9225B User’s Manual
Chapter 2 Register Descriptions
2 – 16
2.4 Control Registers
These registers listed below control various operations of CAN.
Table 2-4 lists the control registers.
Table 2-4 Control Registers
Address Symbol Name
Initial
value
R/W
0EH CANC CAN control register 01hex
Bits 4, 5 and 6 are read-only; bits 2 and 7
are not used; the other bits are R/W
accessible.
0FH CANI CAN interrupt control register 00hex
Bit 3 is not used. The other bits are R/W
accessible.
1EH NMES Message box count setting register 00hex
Bits 4 to 7 are not used. The other bits are
R/W accessible.
1FH BTR0 CAN bus timing register 0 00hex R/W
2EH BTR1 CAN bus timing register 1 00hex
Bit 7 is not used. The other bits are R/W
accessible.
2FH TIOC Communication input/output control register 00hex R/W
3EH GMR0 Group message register 0 00hex
Bits 4 to 6 are not used. The other bits are
R/W accessible.
3FH GMR1 Group message register 1 00hex
Bits 4 to 6 are not used. The other bits are
R/W accessible.
4EH GMSK00 Message mask register 00 00hex R/W
4FH GMSK01 Message mask register 01 00hex R/W
5EH GMSK02 Message mask register 02 00hex R/W
5FH GMSK03 Message mask register 03 00hex
Bits 0 to 2 are not used. The other bits are
R/W accessible.
6EH GMSK10 Message mask register 10 00hex R/W
6FH GMSK11 Message mask register 11 00hex R/W
7EH GMSK12 Message mask register 12 00hex R/W
7FH GMSK13 Message mask register 13 00hex
Bits 0 to 2 are not used. The other bits are
R/W accessible.
8EH STBY Standby control register 00hex
Bits 2 to 7 are not used. The other bits are
R/W accessible.
8FH CANC2 CAN control register 2 00hex R/W
9EH TMN Communication message box number register *–0hex
Bits 4 to 7 are not used. The other bits are
read-only.
9FH CANS CAN status register 00hex
Bits 2, 3, 7 are not used. The other bits are
read-only.
AEH TEC Transmission error counter 00hex Read-only
AFH REC Receive error counter 00hex Read-only
BEH CANS2 CAN status register 2 00hex R/W
BFH BOCO Bus off release counter 00hex Read-only
CEH —
CFH —
DEH —
DFH —
EEH —
EFH —
FEH —
FFH —
Not used (reserve area)
Do not access this area.
* “–” in “–0hex” indicates that the value of the nibble is undefined.
Write a “0” to the unused bits.
B
B
B