mpc82g516a Megawin Technology, mpc82g516a Datasheet - Page 117

• Manufacturer Part Number: mpc82g516a
• Description: 8-bit Microcontroller
• Manufacturer: Megawin Technology

24 Reset Sources
Reset can be triggered from the following reset sources (see Figure 24-1):
• Power-on reset
• Hardware reset from RST-pin
• Watchdog Timer reset
• Software reset
• Brownout reset from Power Monitor
Figure 24-1. Block Diagram of Reset
24.1 Power-On Reset
Power-on reset (POR) is used to internally reset the MCU during power-up. The MCU will keep in reset state and
will not start to work until the VDD power rises above V
activated again whenever the VDD power falls below V
before power is reapplied in order to ensure a power-on reset. See
24.2 Hardware Reset from RST-Pin
A reset is accomplished by holding the RST pin HIGH for at least 24 oscillator periods while the oscillator is
running. To ensure a reliable power-up reset, the hardware reset from RST pin is necessary.
24.3 Watchdog Timer Reset
When the Watchdog Timer is enabled, it will increment every 12 system clock cycles (12/Fosc) while the
oscillator is running. And, the user needs to service it to avoid an overflow, which will generate an internal reset
signal.
117
Note: ENLVRO and ENLVRC are the Hardware Options.
Brownout Detection
LDO
Output Power
(Write '1' to ISPCR.5)
VDD Power
(A High on RST-pin)
V
V
(During Power Up)
OPF
CPF
Watchdog Timer
Power-on Reset
Hardware Reset
Software Reset
(3.7V)
(2.4V)
Reset
+
+
Comp.
Comp.
-
-
MPC82G516A Data Sheet
ENLVRO
ENLVRC
POR
POR
Brownout
(the POR threshold voltage). And, the reset state is
. During a power cycle, VDD must fall below V
Reset
Section 30: DC Characteristics
Internal Reset
for V
MEGAWIN
POR
.
POR