27.1.2 Power Supply for a 5V or Wide-Range System
To have the MPC82G516A work in a 5V system with power supply varying from 2.7V to 5.5V, pin V30 should
not be tied to VDD and an external ripple-filtering capacitor is necessary, as shown in Figure 27-3.
Figure 27-3. Power Supplied to a 5V or Wide-Range System
Power Supply
MPC82G516A
VDD
V30
4.7uF~100uF
VSS
27.2 Reset Circuit
Normally, the power-on reset can be successfully generated during power-up. However, to further ensure the
MCU a reliable reset during power-up, the external reset is necessary. Figure 27-4 shows the external reset
circuit, which consists of a capacitor CEXT connected to VDD (power supply) and a resistor REXT connected to
VSS (ground).
In general, REXT is optional because the RST pin has an internal pull-down resistor (RRST). This internal diffused
resistor to VSS permits a power-up reset using only an external capacitor CEXT to VDD.
See Section 30: DC Characteristics for RRST
.
Figure 27-4. Reset Circuit
MPC82G516A
CC
V
VDD
CEXT
Normally, 1.0uF~3.3uF
RST
REXT
(Optional)
Normally, 100KΩ
RRST
VSS
129
MPC82G516A Data Sheet
MEGAWIN
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
