DSPIC30F2023 Microchip Technology Inc., DSPIC30F2023 Datasheet - Page 209

• Manufacturer Part Number: DSPIC30F2023
• Description: 28/44-pin Dspic30f1010/202x Enhanced Flash Smps 16-bit Digital Signal Controller
• Manufacturer: Microchip Technology Inc.

18.4
The primary oscillator uses is shown in Figure 18-3.
FIGURE 18-3:
18.5
Two of the primary Oscillator modes use an external
clock. These modes are EC and EC with IO.
In the EC mode (Figure 18-4), the OSC1 pin can be
driven by CMOS drivers. In this mode, the OSC1 pin is
high-impedance and the OSC2 pin is the clock output
(F
synchronization purposes.
FIGURE 18-4:
FIGURE 18-5:
© 2006 Microchip Technology Inc.
OSC
/2). This output clock is useful for testing or
PRIMARY OSCILLATOR ON OSC1/
OSC2 PINS:
EXTERNAL CLOCK INPUT
Note 1: A series resistor, Rs, may be required for AT strip cut crystals.
Clock from Ext System
Clock from Ext System
PRIMARY OSCILLATOR
EXTERNAL CLOCK INPUT OPERATION (EC OSCILLATOR CONFIGURATION)
EXTERNAL CLOCK INPUT OPERATION (ECIO OSCILLATOR CONFIGURATION)
C1
2: The feedback resistor, R
C2
XTAL
Rs
(1)
F
OSC
I/O
OSC2/CLKO
OSC1/CLKI
/2
Preliminary
F
, is typically in the range of 2 to 10 M
OSC1
I/O (OSC2)
OSC1
OSC2
dsPIC30F
dsPIC30F
In the EC with IO mode (Figure 18-5), the OSC1 pin
can be driven by CMOS drivers. In this mode, the
OSC1 pin is high-impedance and the OSC2 pin
becomes a general purpose I/O pin. The feedback
device between OSC1 and OSC2 is turned off to save
current.
R
dsPIC30F1010/202X
F
(2)
CLKO/RC15
To CLKGEN
DS70178C-page 207