N78E517A Datasheet, PDF (13/141 Pages) List of Unclassifed Manufacturers – Microcontroller

The application circuit is shown below. The user is recommended follow the circuit enclosed by gray blocks to
achieve the most stable and reliable operation of MCU especially in a noisy power environment for a healthy
EMS immunity. If internal RC oscillator is used as the system clock, a 0.1μF capacitor should be added to gain
a precise RC frequency.
10μF
RST
VDD
V_DD
10kΩ
0.1μF
C1
R
C2
XTAL1
EA
as close to MCU
as possible
0.1μF
10μF
XTAL2
GND
N78E517A
V_SS
as close to the
power source
as possible
Figure 4–5. Application Circuit for Execution of Internal Program Code with External Crystal
Crystal Frequency
4MHz-33MHz
33MHZ-40MHz
R
Without
5kΩ-10kΩ
C1
C2
Depend on crystal
specifications
10μF
RST
VDD
V_DD
10kΩ
0.1μF
0.1μF
XTAL1
EA
as close to MCU
as possible
0.1μF
10μF
XTAL2
GND
as close to MCU
as possible
N78E517A
V_SS
as close to the
power source
as possible
Figure 4–6. Application Circuit for Execution of Internal Program Code with Internal RC Oscillator
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Publication Release Date: September 4, 2012
Revision: V2.2