CP3BT23 Datasheet, PDF (119/260 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

INTERNAL
DIAGEN
EIT
If the Internal function is enabled, the CANTX 18.10.7 CAN Timing Register (CTIM)
and CANRX pins of the CAN module are inter- _{The Can Timing Register (CTIM) defines the configuration}
nally connected to each other. This feature _{of the Bit Time Logic (BTL).}
can be used in conjunction with the LOOP-
BACK mode. This means that the CAN mod-
ule can receive its own sent messages ¹⁵
98 7 6
32
0
without connecting an external transceiver
PSC
SJW
TSEG1
TSEG2
chip to the CANTX and CANRX pins; it allows
software to run real stand-alone tests without
0
any peripheral devices.
R/W
0 – Normal mode.
1 – Internal mode.
The Diagnostic Enable bit globally enables or PSC
The Prescaler Configuration field specifies
disables the special diagnostic features of the
the CAN prescaler. The settings are shown in
CAN module. This includes the following func-
Table 50
tions:
• LO (Listen Only).
• IGNACK (Ignore Acknowledge).
• LOOPBACK (Loopback).
• INTERNAL (Internal Loopback).
• Write access to hidden receive buffer.
0 – Normal mode.
1 – Diagnostic features enabled.
te ^{The Error Interrupt Type bit configures when}
the Error Interrupt Pending Bit (CIPND.EIP-
ND) is set and an error interrupt is generated
if enabled by the Error Interrupt Enable
(CIEN.EIEN).
0 – The EIPND bit is set on every error on the
le ^{CAN bus.}
1 – The EIPND bit is set only if the error state
(CSTPND.NS) changes as a result of in-
crementing either the receive or transmit
error counter.
Obso^SJW
Table 50 CAN Prescaler Settings
PSC6:0
Prescaler
000000
2
000001
3
000010
4
000011
5
000100
6
:
:
1111101
127
1111110
128
1111111
128
The Synchronization Jump Width field speci-
fies the Synchronization Jump Width, which
can be programmed between 1 and 4 time
quanta (see Table 51).
Table 51 SJW Settings
SJW
Synchronization Jump
Width (SJW)
00
1 time quantum
01
2 time quanta
10
3 time quanta
11
4 time quanta
Note: The settings of SJW must be configured to be small-
er or equal to TSEG1 and TSEG2
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