p87c591vfb NXP Semiconductors, p87c591vfb Datasheet - Page 51

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

Philips Semiconductors
12.5.17.4 Single Filter Configuration
In this filter configuration one long filter (4-byte) could be
defined. The bit correspondences between the filter bytes
and the Message bytes depends on the programmed
Frame Format (see ACF Mode Register).
Single Filter Standard Frame:
If the Standard Frame Format is selected, the complete
Identifier including the RTR bit and the first two data bytes
are used for acceptance filtering. Messages may also be
2000 Jul 26
handbook, full pagewidth
Single-chip 8-bit microcontroller with CAN controller
MSB
MSB
Message Bit
Acceptance Code Bit
Acceptance Mask Bit
7
7
Addr.: 16
Addr.: 20
6
6
5
5
4
4
Fig.15 Single Filter Configuration, receiving Standard Frame Messages.
3
3
AMR0
ACR0
2
2
1
1
LSB
LSB
0
0
MSB
MSB
=
7
7
Addr.: 17
Addr.: 21
6
6
5
5
4
4
3
3
1
unused
unused
ACR1
AMR1
2
2
[0]
[6]
[7]
1
1
LSB
LSB
0
0
51
MSB
MSB
accepted if there are no data bytes existing due to a set
RTR bit or if there is no or only one data byte because of
the corresponding data length code.
For a successful reception of a message, all single bit
comparisons have to signal acceptance. Note that the 4
least significant bits of AMR1 and ACR1 are not used. In
order to keep compatible with future products these bits
should be programmed to be “don‘t care” by setting
AMR1.3, AMR1.2, AMR1.1 and AMR1.0 to “1”.
7
7
Addr.: 18
Addr.: 22
&
6
6
5
5
1
0
4
4
3
3
accepted
not accepted
AMR2
ACR2
2
2
1
1
LSB
LSB
0
0
MSB
MSB
7
7
Addr.: 19
Addr.: 23
DBx.y = Data Byte x, Bit y
6
6
5
5
4
4
Preliminary Specification
3
3
AMR3
ACR3
2
2
1
1
MHI015
P8xC591
LSB
LSB
0
0