mpc82g516a Megawin Technology, mpc82g516a Datasheet - Page 115

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

23 Power Monitoring Function
The MPC82G516A incorporates power monitoring functions designed to prevent incorrect operation during initial
power-up and power loss or reduction during operation. This is accomplished with two hardware functions:
Power-on Detection and Brownout Detection. Figure 23-1 shows the block diagram of power monitoring function.
Figure 23-1. Power Monitor Block Diagram
23.1 Power-on Detection
The POF flag (PCON.4) is set by hardware to indicate an initial power-up condition. It remains set until cleared by
software, and therefore helps the user to check if the start-running of the MCU comes from cold start (i.e., power
up) or warm start (such as hardware reset from RST pin, software reset or WDT reset). In addition to an initial
power-up condition, the POF flag will also be set by hardware whenever the VDD power falls below V
PCON (Address=87H, Power Control Register, Reset Value=00xx,0000B (or 00x1,0000B after Power-On Reset))
POF: Power-ON Flag. This bit is set during power-on reset. It can also be set by software. However, it can only
be cleared by software.
115
SMOD
Power-on Detection
Brownout Detection
Brownout
7
Reset
SMOD0
6
Note: ENLVRO and ENLVRC are the Hardware Options.
5
-
ENLVRO
ENLVRC
V
POF
V
V
POR
4
CPF
OPF
(2.1V)
(2.4V)
(3.7V)
MPC82G516A Data Sheet
GF1
3
Comparator
+
Comparator
+
Comparator
+
-
-
-
Power-on
Reset
GF0
2
Voltage Regulator
Low Drop-Out
(LDO)
PD
Load
1
Load
Load
POF
OPF
CPF
"1"
"1"
"1"
IDL
3.0V Output
0
Input/Output
CPU Core,
RAM,
Flash,
Peripherals,
Glue Logic
Buffer
Inside the Chip
POR
MEGAWIN
.
VDD
V30