![NXP Semiconductors LCP43 Series User Manual Download Page 1072](http://html1.mh-extra.com/html/nxp-semiconductors/lcp43-series/lcp43-series_user-manual_17218171072.webp)
UM10503
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1072 of 1269
NXP Semiconductors
UM10503
Chapter 42: LPC43xx C_CAN
42.6.1.6 CAN test register
Write access to the Test Register is enabled by setting bit Test in the CAN Control
Register.
The different test functions may be combined, but when TX[1:0]
“00” is selected, the
message transfer is disturbed.
42.6.1.7 CAN baud rate prescaler extension register
Table 938. CAN test register (TEST, address 0x400E 2014 (C_CAN0) and 0x400A 4014
(C_CAN1)) bit description
Bit
Symbol
Value
Description
Reset
value
Access
1:0
-
-
-
2
BASIC
Basic mode
0
R/W
0
Basic mode disabled.
1
IF1 registers used as TX buffer, IF2 registers
used as RX buffer.
3
SILENT
Silent mode
0
R/W
0
Normal operation.
1
The module is in silent mode.
4
LBACK
Loop back mode
0
R/W
0
Loop back mode is disabled.
1
Loop back mode is enabled.
6:5
TX1_0
Control of TD pins
00
R/W
0x0
Level at the TD pin is controlled by the CAN
controller. This is the value at reset.
0x1
The sample point can be monitored at the TD
pin.
0x2
TD pin is driven LOW/dominant.
0x3
TD pin is driven HIGH/recessive.
7
RX
Monitors the actual value of the RD Pin
0
R
0
The CAN bus is dominant (RD = 0).
1
The CAN bus is recessive (RD = 1).
31:8
-
Reserved
-
Table 939. CAN baud rate prescaler extension register (BRPE, address 0x400E 2018
(C_CAN0) and 0x400A 4018 (C_CAN1)) bit description
Bit
Symbol
Description
Reset
value
Access
3:0
BRPE
Baud rate prescaler extension
By programming BRPE the Baud Rate Prescaler
can be extended to values up to 1023. Hardware
interprets the value as the value of BRPE (MSBs)
and BRP (LSBs) plus one.
Allowed values are 0x00 to 0x0F
0x0000 R/W
31:4
-
Reserved
-
-