p87c591vfb NXP Semiconductors, p87c591vfb Datasheet - Page 54

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

Philips Semiconductors
For a successful reception of a message, all single bit
comparisons of at least one complete filter have to signal
acceptance. In case of a set RTR bit or a data length code
of “0” no data byte is existing. Nevertheless, a message
may pass Filter 1, if the first part up to the RTR bit signals
acceptance.
If no data byte filtering is required for Filter 1, the four least
significant bits of AMR1 and AMR3 have to be set “1”
(don‘t care). Then both filters are working identically using
the standard identifier range including the RTR bit.
2000 Jul 26
handbook, full pagewidth
Single-chip 8-bit microcontroller with CAN controller
Filter 1
Message
Filter 2
Filter 1
Filter 2
Fig.18 Dual Filter Configuration, receiving Extended 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
54
1
1
5
5
5
5
Dual Filter Extended Frame:
If the Extended Frame Format is selected, the two defined
filters are looking identically. Both filters are comparing the
first two bytes of the Extended Identifier range only.
For a successful reception of a message, all single bit
comparisons of at least one complete filter have to signal
acceptance.
4
4
4
4
[0]
[0]
[7]
[6]
[6]
[7]
3
3
3
3
. . .
. . .
. . .
. . .
. . .
. . .
AMR1
ACR1
AMR3
ACR3
2
2
2
2
1
1
1
1
LSB
LSB
LSB
LSB
&
&
0
0
0
0
MHI018
1
1
0
accepted
not accepted
Preliminary Specification
P8xC591