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Chapter 34 CAN Controller
2.Register Description
These registers hold the IntPnd bits of the 32 Message Objects. By reading out the IntPnd bits, the CPU can
check for which Message Object an interrupt is pending. The IntPnd bit of a specific Message Object can be
set/reset by the CPU via the IFx Message Interface Registers or by the Message Handler after reception or
after a successful transmission of a frame. This will also affect the value of IntId in the Interrupt Register.
If more than 32 message buffers are implemented, the following table gives an overview about the additional
flags:
Table 2-3 Additional flags when more than 32 message buffers exist
■ Message Valid Registers (MSGVAL)
1 This message object is the source of an interrupt.
addr+0 addr+1 addr+2 addr+3
INTPND 4 & 3 IntPnd 64-33 (address 0xA4) IntPnd64-57 IntPnd56-49 IntPnd48-41 IntPnd40-33
INTPND 6 & 5 IntPnd 96-65 (address 0xA8) IntPnd96-89 IntPnd88-81 IntPnd80-73 IntPnd72-65
INTPND 8 & 7 IntPd 128-97 (address 0xAC)
IntPnd128-
121
IntPnd120-
113
IntPnd112-
105
IntPnd104-
97
MsgVal32-25
⇐ Bit no.
Read/write ⇒
(R) (R) (R) (R) (R) (R) (R) (R)
Default value⇒
(0) (0) (0) (0) (0) (0) (0) (0)
Message Valid Register 2 high byte
Address : Base + 0xB0
H
15 14 13 12 11 10 9 8
MSGVAL2H
MsgVal24-17
⇐ Bit no.
Read/write ⇒
(R) (R) (R) (R) (R) (R) (R) (R)
Default value⇒
(0) (0) (0) (0) (0) (0) (0) (0)
Address :
Base + 0x
B1H
765432 10
MSGVAL2L
Message Valid Register 2 low byte
MsgVal16-9
⇐ Bit no.
Read/write ⇒
(R) (R) (R) (R) (R) (R) (R) (R)
Default value⇒
(0) (0) (0) (0) (0) (0) (0) (0)
Message Valid Register 1 high byte
Address : Base + 0xB2
H
15 14 13 12 11 10 9 8
MSGVAL1H
MsgVal8-1
⇐ Bit no.
Read/write ⇒
(R) (R) (R) (R) (R) (R) (R) (R)
Default value⇒
(0) (0) (0) (0) (0) (0) (0) (0)
Address :
Base + 0x
B3H
765432 10
MSGVAL1L
Message Valid Register 1 low byte