mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 372

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 12 Freescale’s Scalable Controller Area Network (MSCANV2)
372
Extended Identifier
Standard Identifier
CAN 2.0A/B
•
•
•
CAN 2.0B
Four identifier acceptance filters, each to be applied to
— a) the 14 most significant bits of the extended identifier plus the SRR and IDE bits of CAN 2.0B
— b) the 11 bits of the standard identifier, the RTR and IDE bits of CAN 2.0A/B messages.
Eight identifier acceptance filters, each to be applied to the first 8 bits of the identifier. This mode
implements eight independent filters for the first 8 bits of a CAN 2.0A/B compliant standard
identifier or a CAN 2.0B compliant extended identifier.
filter bank (CANIDAR0–CANIDAR3, CANIDMR0–CANIDMR3) produces filter 0 to 3 hits.
Similarly, the second filter bank (CANIDAR4–CANIDAR7, CANIDMR4–CANIDMR7)
produces filter 4 to 7 hits.
Closed filter. No CAN message is copied into the foreground buffer RxFG, and the RXF flag is
never set.
messages or
Figure 12-38
CANIDMR0–3CANIDMR) produces filter 0 and 1 hits. Similarly, the second filter bank
(CANIDAR4–CANIDAR7, CANIDMR4–CANIDMR7) produces filter 2 and 3 hits.
AM7
AC7
ID28
ID10
CANIDMR0
CANIDAR0
IDR0
IDR0
Figure 12-37. 32-bit Maskable Identifier Acceptance Filter
shows how the first 32-bit filter bank (CANIDAR0–CANIDA3,
AM0
ID21
AC0
ID3
MC9S12HZ256 Data Sheet, Rev. 2.05
AM7
AC7
ID20
ID2
CANIDMR1
CANIDAR1
IDR1
IDR1
ID Accepted (Filter 0 Hit)
IDE
AM0
ID15
AC0
AM7
AC7
ID14
ID10
Figure 12-39
CANIDMR2
CANIDAR2
IDR2
IDR2
shows how the first 32-bit
AM0
AC0
ID7
ID3
AM7
AC7
ID6
ID10
Freescale Semiconductor
CANIDMR3
CANIDAR3
IDR3
IDR3
AM0
AC0
RTR
ID3