M0564LE4AE Datasheet, PDF (62/161 Pages) List of Unclassifed Manufacturers – 32-BIT MICROCONTROLLER

M0564
6.2.2.2 Power-on Reset (POR)
The Power-on reset (POR) is used to generate a stable system reset signal and forces the
system to be reset when power-on to avoid unexpected behavior of MCU. When applying the
power to MCU, the POR module will detect the rising voltage and generate reset signal to system
until the voltage is ready for MCU operation. At POR reset, the PORF(SYS_RSTSTS[0]) will be
set to 1 to indicate there is a POR reset event. The PORF(SYS_RSTSTS[0]) bit can be cleared by
writing 1 to it. Figure 6.2-3 shows the power-on reset waveform.
V_POR
V_DD
Power-on
Reset
0.1V
Figure 6.2-3 Power-on Reset (POR) Waveform
6.2.2.3 Low Voltage Reset (LVR)
If the Low Voltage Reset function is enabled by setting the Low Voltage Reset Enable Bit LVREN
(SYS_BODCTL[7]) to 1, after 200us delay, LVR detection circuit will be stable and the LVR
function will be active. Then LVR function will detect AV_DD during system operation. When the
AV_DD voltage is lower than V_LVR and the state keeps longer than De-glitch time set by LVRDGSEL
(SYS_BODCTL[14:12]), chip will be reset. The LVR reset will control the chip in reset state until
the AV_DD voltage rises above V_LVR and the state keeps longer than De-glitch time set by
LVRDGSEL (SYS_BODCTL[14:12]). The default setting of Low Voltage Reset is enabled without
De-glitch function. Figure 6.2-4 shows the Low Voltage Reset waveform.
May 05, 2017
Page 62 of 161
Rev 1.00