 English |
|
|
|
|
|
|
|
| LM3S5749 Datasheet, PDF (648/947 Pages) Texas Instruments – Stellaris® LM3S5749 Microcontroller | |||
| |||
| ◁ |
Controller Area Network (CAN) Module
tPhase1 = 4 * tq
tPhase2 = 4 * tq
\\tPhase1 = tPhase2
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.
16.4
Register Map
Table 16-4 on page 648 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 module clock must be enabled before the registers can be programmed (see
page 226). There must be a delay of 3 system clocks after the CAN module clock is enabled before
any CAN module registers are accessed.
Table 16-4. 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
Reset
0x0000.0001
0x0000.0000
0x0000.0000
0x0000.2301
0x0000.0000
0x0000.0000
Description
CAN Control
CAN Status
CAN Error Counter
CAN Bit Timing
CAN Interrupt
CAN Test
See
page
651
653
655
656
657
658
648
November 17, 2011
Texas Instruments-Production Data
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese