p87c591vfb NXP Semiconductors, p87c591vfb Datasheet - Page 53

• Manufacturer Part Number: p87c591vfb
• Description: Single-chip 8-bit Microcontroller With Can Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
12.5.17.5 Dual Filter Configuration
In this filter configuration two short filters could be defined.
A received message is compared with both filters to
decide, whether this message should be copied into the
Receive Buffer or not. If at least one of the filters signals an
acceptance, the received message becomes valid. The bit
correspondences between the filter bytes and the
message bytes depends on the currently received Frame
Format.
2000 Jul 26
handbook, full pagewidth
Single-chip 8-bit microcontroller with CAN controller
Filter 1
Message
Filter 2
Filter 1
Filter 2
Fig.17 Dual Filter Configuration, receiving Standard Frame Messages.
Acceptance Mask Bit
Acceptance Code Bit
Message Bit
Acceptance Code Bit
Acceptance Mask Bit
MSB
MSB
MSB
MSB
7
7
7
7
Addr.: 16
Addr.: 20
Addr.: 22
Addr.: 18
6
6
6
6
5
5
5
5
4
4
4
4
3
3
3
3
AMR0
ACR0
AMR2
ACR2
2
2
2
2
1
1
1
1
=
=
.
.
.
.
.
.
LSB
LSB
LSB
LSB
0
0
0
0
MSB
MSB
MSB
MSB
7
7
7
7
Addr.: 17
Addr.: 21
Addr.: 23
Addr.: 19
6
6
6
6
53
1
1
5
5
5
5
Dual Filter Standard Frame:
If the Standard Frame Format is selected, the two defined
filters are different. The first filter compares the complete
Standard Identifier including the RTR bit and the first Data
Byte of the message. The second filter just compares the
complete Standard Identifier including the RTR bit.
4
4
4
4
[0]
[0]
[7]
[6]
[6]
[7]
3
3
. . .
. . .
. . .
. . .
. . .
. . .
AMR3
ACR3
AMR1
ACR1
2
2
1
1
LSB
LSB
&
&
0
0
3
3
MHI017
ACR3
AMR3
2
2
1
1
1
LSB
LSB
0
0
1
0
accepted
not accepted
Preliminary Specification
P8xC591