Infineon Technologies TC1728 User Manual page 1313

• All actions are immediately stopped (Hard Suspend Mode):
The module clocks
becomes active. Read and write operations to the module are no longer possible.
This means that the CAN registers cannot be accessed anymore. In this mode, there
is a very high probability that the communication with other CAN devices is made
impossible, and that the CAN bus is blocked (e.g. if the suspended CAN module just
sends a dominant level). A reset operation must be executed to leave Hard Suspend
Mode.
• The current action is finished (Soft Suspend Mode):
The module clock
after internal actions have been finished (for example, after a CAN frame has been
sent out). The end of the internal actions is indicated to the fractional divider by a
suspend mode acknowledged signal. Due to this behavior, the communication
network is not blocked. Furthermore, all registers are accessible for read and write
actions. As a result, the debugger can stop the module actions and modify registers.
These modifications are taken into account after the Suspend Mode is left.
The Hard Suspend Mode can be enabled/disabled only for the complete MultiCAN
module. The Soft Suspend Mode can be individually enabled for each CAN node.
The fractional divider disables module clock
can be suspended. A CAN node that is not active can always be suspended.
User's Manual
MultiCAN, V2.24
Controller Area Network Controller (MultiCAN)
f f
and are switched off as soon as the suspend request
CLC CAN
f
keeps running. Module functions are stopped automatically
CLC
f
only if all CAN nodes signal that they
CAN
20-20
TC1728
V1.0, 2011-12