TC1784
System Control Unit (SCU)
User´s Manual
3-62
V1.1, 2011-05
32-bit SCU, V1.18
3.2
Reset Operation
This section describes the conditions under which the TC1784 will be reset and the reset
operation configuration and control.
3.2.1
Overview
The following reset request triggers are available:
•
1 External power-on hardware reset request trigger; PORST, (cold reset)
•
2 External System Request reset triggers; ESR0, and ESR1,(warm reset)
•
Watchdog Timer (WDT) reset request trigger, (warm reset)
•
Software reset (SW), (warm reset)
•
Debug (OCDS) reset request trigger, (warm reset)
•
Resets via the JTAG interface
•
Flash Tuning Protection (TP) (warm reset)
•
JTAG reset (special reset)
Note: The JTAG and OCDS resets are described in the OCDS chapter.
There are two basic types of reset request triggers:
•
Trigger sources that do not depend on a clock, such as the PORST. This trigger force
the device into an asynchronous reset assertion independently of any clock. The
activation of an asynchronous reset is asynchronous to the system clock, whereas
its de-assertion is synchronized.
•
Trigger sources that need a clock in order to be asserted, such as the input signals
ESR0,ESR1, the WDT trigger, TP trigger, or the SW trigger.
Note: A PORST reset should only triggered for power related issue and not for pure
functional purpose.
3.2.2
Reset Types
The following summary shows the different reset types.
•
Power-on Reset:
This reset leads to a initialization into a defined state of the complete system. This
reset should only be requested on a real power-on event and can not by any non
power related event.
A Power-on Reset also generates a System Reset and an Application Reset.
•
System Reset:
This reset leads to a initialization into a defined state of the complete system without
the following parts: reset control, power control.
A System Reset also generates an Application Reset.
•
Debug Reset:
This reset leads to a initialization into a defined state of the complete debug system.
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