CMT2380F17
Rev0.1 | 335/347
www.cmostek.com
32 Application Notes
32.1
Power Supply Circuit
To have the CMT2380F17 work with power supply varying from 2.0V to 5.5V, adding some external
decoupling and bypass capacitors is necessary, as shown in Figure 32
–1.
VDD
VR0
VSS
Power Supply
0.1uF
4.7uF
MCU
0.1uF
10uF
Figure 32-1. Power Supplied Circuit
32.2
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 32
–2 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.
VDD
RST
VSS
Power Supply
MCU
R
RST
R
EXT
(Optional)
C
EXT
4.7uF
47K
Ω
Figure 30-2. Reset Circuit
32.3
ICP and OCD Interface Circuit
CMT2380F17 devices include an on-chip Megawin proprietary debug interface to allow
In-Chip-Programming (ICP) and in-system On-Chip-Debugging (OCD) with the production part installed in the
end application. The ICP and OCD share the same interface to use a clock signal (ICP_SCL/OCD_SCL) and
a bi-directional data signal (ICP_SDA/OCD_SDA) to transfer information between the device and a host
system.
Summary of Contents for CMT2380F17
Page 27: ...CMT2380F17 Rev0 1 27 347 www cmostek com 1 25 Phase Noise...
Page 177: ...CMT2380F17 Rev0 1 177 347 www cmostek com Figure 17 3 PCA Interrupt System...
Page 246: ...CMT2380F17 Rev0 1 246 347 www cmostek com SnMIPS S0MI S1MI 1 P3 3 P4 7...
