MSCAN08 Controller (MSCAN08)
Identifier Acceptance Filter
MC68HC08AZ32A — Rev 1.0
Technical Data
MOTOROLA
MSCAN08 Controller (MSCAN08)
For More Information On This Product,
Go to: www.freescale.com
331
Single identifier acceptance filter, each to be applied to a) the full
29 bits of the extended identifier and to the following bits of the
CAN frame: RTR, IDE, SRR or b) the 11 bits of the standard
identifier plus the RTR and IDE bits of CAN 2.0A/B messages.
This mode implements a single filter for a full length CAN 2.0B
compliant extended identifier.
Figure 20-3
shows how the 32-bit
filter bank (CIDAR0-3, CIDMR0-3) produces a filter 0 hit.
Two identifier acceptance filters, each to be applied to a) the 14
most significant bits of the extended identifier plus the SRR and
the IDE bits of CAN2.0B messages, or b) the 11 bits of the
identifier plus the RTR and IDE bits of CAN 2.0A/B messages.
Figure 20-4
shows how the 32-bit filter bank (CIDAR0-3,
CIDMR0-3) produces filter 0 and 1 hits.
Four identifier acceptance filters, each to be applied to the first
eight bits of the identifier. This mode implements four independent
filters for the first eight bits of a CAN 2.0A/B compliant standard
identifier.
Figure 20-5
shows how the 32-bit filter bank (CIDAR0-
3, CIDMR0-3) produces filter 0 to 3 hits.
Closed filter. No CAN message will be copied into the foreground
buffer RxFG, and the RXF flag will never be set.
Figure 20-3. Single 32-Bit Maskable Identifier Acceptance Filter
ID28
ID21
IDR0
ID10
ID3
IDR0
ID20
ID15
IDR1
ID2
IDE
IDR1
ID14
ID7
IDR2
ID10
ID3
IDR2
ID6
RTR
IDR3
ID10
ID3
IDR3
AC7
AC0
CIDAR0
AM7
AM0
CIDMR0
AC7
AC0
CIDAR1
AM7
AM0
CIDMR1
AC7
AC0
CIDAR2
AM7
AM0
CIDMR2
AC7
AC0
CIDAR3
AM7
AM0
CIDMR3
ID Accepted (Filter 0 Hit)
F
Freescale Semiconductor, Inc.
n
.