LM3S2276 Datasheet, PDF (610/785 Pages) Texas Instruments – Stellaris® LM3S2276 Microcontroller

Controller Area Network (CAN) Module
16.1
Block Diagram
Figure 16-1. CAN Controller Block Diagram
CAN Control
CANCTL
CANSTS
CANERR
CANBIT
CANINT
CANTST
CANBRPE
ABP
Pins
APB
Interface
CAN Interface 1
CANIF1CRQ
CANIF1CMSK
CANIF1MSK1
CANIF1MSK2
CANIF1ARB1
CANIF1ARB2
CANIF1MCTL
CANIF1DA1
CANIF1DA2
CANIF1DB1
CANIF1DB2
CAN Interface 2
CANIF2CRQ
CANIF2CMSK
CANIF2MSK1
CANIF2MSK2
CANIF2ARB1
CANIF2ARB2
CANIF2MCTL
CANIF2DA1
CANIF2DA2
CANIF2DB1
CANIF2DB2
CAN Core
CAN Tx
CAN Rx
Message Object
Registers
CANTXRQ1
CANTXRQ2
CANNWDA1
CANNWDA2
CANMSG1INT
CANMSG2INT
CANMSG1VAL
CANMSG2VAL
Message RAM
32 Message Objects
16.2
Signal Description
Table 16-1 on page 610 lists the external signals of the CAN controller and describes the function
of each. The CAN controller signals are alternate functions for some GPIO signals and default to
be GPIO signals at reset. The column in the table below titled "Pin Assignment" lists the possible
GPIO pin placements for the CAN signals. The AFSEL bit in the GPIO Alternate Function Select
(GPIOAFSEL) register (page 368) should be set to choose the CAN controller function. For more
information on configuring GPIOs, see “General-Purpose Input/Outputs (GPIOs)” on page 348.
Table 16-1. Controller Area Network Signals (64LQFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
CAN0Rx
58
I
TTL
CAN module 0 receive.
610
November 17, 2011
Texas Instruments-Production Data