Datasheet

MSCAN Controller (MSCAN08)
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
272 Freescale Semiconductor
• 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 23-4 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 23-5 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 23-3. Single 32-Bit Maskable Identifier Acceptance Filter
Figure 23-4. Dual 16-Bit Maskable Acceptance Filters
ID28 ID21IDR0
ID10 ID3IDR0
ID20 ID15IDR1
ID2 IDEIDR1
ID14 ID7IDR2
ID10 ID3IDR2
ID6 RTRIDR3
ID10 ID3IDR3
AC7 AC0CIDAR0
AM7 AM0CIDMR0
AC7 AC0CIDAR1
AM7 AM0CIDMR1
AC7 AC0CIDAR2
AM7 AM0CIDMR2
AC7 AC0CIDAR3
AM7 AM0CIDMR3
ID Accepted (Filter 0 Hit)
ID28 ID21IDR0
ID10 ID3IDR0
ID20 ID15IDR1
ID2 IDEIDR1
ID14 ID7IDR2
ID10 ID3IDR2
ID6 RTRIDR3
ID10 ID3IDR3
AC7 AC0CIDAR0
AM7 AM0CIDMR0
AC7 AC0CIDAR1
AM7 AM0CIDMR1
ID ACCEPTED (FILTER 0 HIT)
AC7 AC0CIDAR2
AM7 AM0CIDMR2
AC7 AC0CIDAR3
AM7 AM0CIDMR3
ID ACCEPTED (FILTER 1 HIT)