TC1796
Peripheral Units (Vol. 2 of 2)
Controller Area Network (MultiCAN) Controller
User’s Manual
22-42
V2.0, 2007-07
MultiCAN, V2.0
22.3.9.2 Pending Messages
When a message interrupt request is generated, a message pending bit is set in one of
the Message Pending Registers. There are eight Message Pending Registers, MSPNDk
(k = 0-7), with 32 pending bits available each, resulting in 256 pending bits.
shows the allocation of the message pending bits.
Figure 22-18 Message Pending Bit Allocation
The location of a pending bit is defined by two demultiplexers selecting the number k of
the MSPNDk registers (3-bit demux), and the bit location within the corresponding
MSPNDk register (5-bit demux).
255
224
MCA05844
7
6
5
4
3
2
1
0
MPN
Message Object n Interrupt Pointer Register MOIPRn[15:0]
3
2
1
0
TXINP
3
2
1
0
RXINP
15
D
E
M
U
X
0
7
D
E
M
U
X
0
31
31
0
. . . . . . . . . . . . . . .
.
.
.
.
. .
.
.
4
3
2
1
0
MPSEL
Modul Control Register MCR[31:0]
MSB
Message Pending Registers
0 = transmit event
1 = receive event
223
159
191
127
95
63
192
160
128
96
64
32
MSPND0
MSPND1
MSPND2
MSPND3
MSPND4
MSPND5
MSPND6
MSPND7
2
1
0
7
6
5
4
3:0
31
0
0
0
1
0
1
0
1
0 1
0 1
0 1
0 1
0
1
