SN32F260 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 36 Version 1.5
System initialization: All system registers is set as initial conditions and system is ready.
Oscillator warm up: Oscillator operation is successfully and supply to system clock.
Program executing: Power on sequence is finished and program executes from Boot loader.
The external reset can reset the system during power on duration, and good external reset circuit can protect the
system to avoid working at unusual power condition, e.g. brown out reset in AC power application.
3.1.4.1 SIMPLY RC RESET CIRCUIT
MCU
VDD
VSS
VCC
GND
R
S
T
R1
47K ohm
C1
0.1uF
R2
100 ohm
This is the basic reset circuit, and only includes R1 and C1. The RC circuit operation makes a slow rising signal into
reset pin as power up. The reset signal is slower than VDD power up timing, and system occurs a power on signal from
the timing difference.
Note: The reset circuit is no any protection against unusual power or brown out reset.
3.1.4.2 DIODE & RC RESET CIRCUIT
MCU
VDD
VSS
VCC
GND
R
S
T
R1
47K ohm
C1
0.1uF
DIODE
R2
100 ohm
This is the better reset circuit. The R1 and C1 circuit operation is like the simply reset circuit to make a power on signal.
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