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eCAN Registers
815
SPRUI07–March 2020
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Controller Area Network (CAN)
Table 13-21. Error and Status Register (CANES) Field Descriptions (continued)
Bit Field Value Description
16 EW Warning status
1 One of the two error counters (CANREC or CANTEC) has reached the warning level of 96.
0 Values of both error counters (CANREC and CANTEC) are less than 96.
15:6 Reserved Reads are undefined and writes have no effect.
5 SMA Suspend mode acknowledge. This bit is set after a latency of one clock cycle—up to the length of
one frame—after the suspend mode was activated. The suspend mode is activated with the
debugger tool when the circuit is not in run mode. During the suspend mode, the CAN module is
frozen and cannot receive or transmit any frame. However, if the CAN module is transmitting or
receiving a frame when the suspend mode is activated, the module enters suspend mode only at
the end of the frame. Run mode is when SOFT mode is activated (CANMC.16 = 1).
1 The module has entered suspend mode.
0 The module is not in suspend mode.
4 CCE Change configuration enable. This bit displays the configuration access right. This bit is set after a
latency of one clock cycle.
1 The CPU has write access to the configuration registers.
0 The CPU is denied write access to the configuration registers.
Note: The reset state of the CCE bit is 1. That is, upon reset, you can write to the bit timing
registers. However, once the CCE bit is cleared (as part of the module initialization), the CANRX
pin must be sensed high before you can set the CCE bit to 1 again.
3 PDA Power-down mode acknowledge
1 The CAN module has entered the power-down mode.
0 Normal operation
2 Reserved Reads are undefined and writes have no effect.
1 RM Receive mode. The CAN module is in receive mode. This bit reflects what the CAN module is
actually doing regardless of mailbox configuration.
1 The CAN module is receiving a message.
0 The CAN module is not receiving a message.
0 TM Transmit mode. The CAN module is in transmit mode. This bit reflects what the CAN module is
actually doing regardless of mailbox configuration.
1 The CAN module is transmitting a message.
0 The CAN module is not transmitting a message.
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