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| LM3S2793 Datasheet, PDF (898/1194 Pages) Texas Instruments – Stellaris® LM3S2793 Microcontroller | |||
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Controller Area Network (CAN) Module
tTSeg1 = tProp + tPhase1
tTSeg1 = (1 * tq) + (4 * tq)
tTSeg1 = 5 * tq
tTSeg2 = tPhase2
tTSeg2 = (Information Processing Time + 4) Ã tq
tTSeg2 = 4 * tq
\\Assumes IPT=0
tSJW = 4 * tq
\\Least of 4, Phase1, and Phase2
TSEG2
TSEG1
SJW
BRP
= TSeg2 -1
= 4-1
=3
= TSeg1 -1
= 5-1
=4
= SJW -1
= 4-1
=3
= Baud rate prescaler - 1
= 50-1
=49
The final value programmed into the CANBIT register = 0x34F1.
18.4
Register Map
Table 18-6 on page 898 lists the registers. All addresses given are relative to the CAN base address
of:
â CAN0: 0x4004.0000
â CAN1: 0x4004.1000
Note that the CAN controller clock must be enabled before the registers can be programmed (see
page 262). There must be a delay of 3 system clocks after the CAN module clock is enabled before
any CAN module registers are accessed.
Table 18-6. CAN Register Map
Offset Name
Type
0x000 CANCTL
R/W
0x004 CANSTS
R/W
0x008 CANERR
RO
0x00C CANBIT
R/W
0x010 CANINT
RO
0x014 CANTST
R/W
0x018 CANBRPE
R/W
0x020 CANIF1CRQ
R/W
Reset
0x0000.0001
0x0000.0000
0x0000.0000
0x0000.2301
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0001
Description
CAN Control
CAN Status
CAN Error Counter
CAN Bit Timing
CAN Interrupt
CAN Test
CAN Baud Rate Prescaler Extension
CAN IF1 Command Request
See
page
901
903
906
907
908
909
911
912
898
January 20, 2012
Texas Instruments-Production Data
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