TC1784
System Control Unit (SCU)
User´s Manual
3-66
V1.1, 2011-05
32-bit SCU, V1.18
•
Second to configure the reset length in a way that the reset outputs via the ESRx pins
match with the reset input requirements of external blocks connected with the reset
outputs.
A reset counter RSTCNT is an 16-bit counter counting down from the reload value
defined by RSTCNTCON.RELx (x = SA or D). The counter is started by the control block
as soon as a reset request trigger condition becomes active (for more information see
). Whether the counter has to be started or not depends on the
reset request trigger and whether the counter is already active or not. In case that the
counter is inactive, not counting down, it is always started. While the counter is already
active it depends on the reset of the new reset request trigger that was asserted anew if
the counter is restarted or not. This behavior is summarized in
.
RSTCNTx ensures that a reset request trigger generates a reset of a minimum length
which is configurable. But if a reset request trigger is asserted continuously longer than
the counter needs for the complete count-down process the reset cannot be deasserted
before the reset request trigger is also deasserted. Anyway the counter is not started
again, instead the control block informs the distribution logic (DIST) that the reset still has
to be asserted until the reset request trigger is deasserted.
The reset state of the control block is implemented such that the RSTCNTA is started
and two reset types (System and Application) have to be asserted by the distribution
logic.
The reset state of the control block is implemented such that the RSTCNTD is started
and the Debug Reset has to be asserted by the distribution logic.
Note: The reset counter should not be configured with a value lower than 20
H
due to the
implementation.
Table 3-6
Restart of RSTCNTA
Reset Active
New Reset Request
Power-on
System
Debug
Application
Power-on Reset Restart
No Restart
No Restart
No Restart
System
Restart
No Restart
No Restart
No Restart
Application
Restart
Restart
No Restart
No Restart
Table 3-7
Restart of RSTCNTD
Reset Active
New Reset / Reset Type Request
Power-on
System
Debug
Application
Debug
Restart
No Restart
No Restart
No Restart
Содержание TC1784
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