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21.2 Block Diagram of CAN Controller
Figure 21.2-1 shows a block diagram of the CAN controller.
■ Block Diagram of CAN Controller
Figure 21.2-1 Block Diagram of CAN Controller
F
2
MC-16LX bus
PSC
TS1
RSJ
TOE
TS
RS
HALT
NIE
NT
NS1, 0
BTR
CSR
Clock
Prescaler
1 to 64 frequency division
Bit timing generation SYNC, TSEG1, TSEG2
TQ (Operating clock)
Node status change
interrupt generation
Node status
change interrupt
Error
control
RTEC
BVALR
TREQR
Transmitting/
receiving sequencer
Data
counter
Acceptance
filter control
Bus state
machine
TDLC RDLC IDSEL
Error frame
generation
Overload
frame
generation
BITER, STFER,
CRCER, FRMER,
ACKER
ARBLOST
IDLE, SUSPND,
transmit, receive,
ERR, OVRLD
Output
driver
TX
TBFx clear
Transmitting buffer
x decision
TBFx
TCANR
TRTRR
RFWTR
TCR
TIER
RCR
RIER
RRTRR
ROVRR
AMSR
AMR0
TBFx
TBFx, set, clear
Transmission complete
interrupt generation
Transmission
complete
interrupt
Reception
complete
interrupt
RBFx, set
Reception complete
interrupt generation
RBFx, TBFx, set, clear
RBFx, set
IDSEL
0
1
Acceptance
filter
Receiving buffer
to decision
RBFx
IDR0 to 15,
DLCR0 to 15,
DTR0 to 15,
RAM
RAM address
generation
RBFx, TBFx, RDLC, TDLC, IDSEL
Transmission
shift register
TDLC
CRC
generation
Stuffing
ACK
generation
Receive shift
register
RDLC
Destuffing/stuffing
error check
CRCER
CRC generation/error
check
STFER
Arbitration
check
Bit error
check
Form error
check
Acknowledgment
error check
ARBLOST
BITER
ACKER
FRMER
Input
latch
RX
PH1
LEIR
IDER
TS2
AMR1