User Manual
126
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
System Control Unit - Digital Modules (SCU-DM)
7.4.4
Functional Description of Reset Types
This section describes the definition and controls depending on the reset source.
7.4.4.1
Power-On / Brown-out Reset
Power-on reset is the highest level reset whereby the whole system is powered up and reset. Brown-out reset
occurs when any required voltage drops below its minimum threshold.
In user mode, the system clock is switched to the PLL output at the defined frequency of the device.
7.4.4.2
Wake-up Reset
Wake-up reset occurs due to enabled event on defined functional input pins leading to reset of device while
the device was in power-save mode. Wake-up reset from sleep and power-down (stop) mode is differentiated
by respective indicator bits In case of wake-up from Sleep Mode, reset is always effected. Note that event on
RESET input pin while device was in power-save mode is effectively a hardware reset. In this case, the wake-
up indicator bit WKRS is also set.
Wake-up reset has the next highest priority after power-on/brown-out reset.
In user mode, the system clock is switched to the PLL output at the defined frequency of the device.
7.4.4.3
Hardware Reset
Hardware reset is requested asynchronously by event on external RESET (low active) input pin, and has the
next highest priority after wake-up reset.
In case of hardware reset is activated while the device is in power-save mode, this is effectively a wake-up
reset. Refer
In user mode, the system clock is switched
For details of programming the reset blind time of the external RESET (low active) input pin see the
corresponding reset pin blind time register, RESPIN_BLIND_TIME.
7.4.4.4
WDT1 Reset
WDT1 reset occurs due to WDT1 timer overflow or when servicing in a closed window, and has the next highest
priority after hardware reset.
In user mode, the system clock is switched to the PLL output at the defined frequency of the device.
7.4.4.5
Soft Reset
Soft reset occurs due to software set of the soft reset request bit.
This has the lowest priority level. With this reset, the device continues running on the previous clock system
configuration.