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(2) Changing the Internal Oscillator Circuit of the Emulation Pod
An oscillator circuit board for 16 MHz (for XIN) and 14.318 MHz (for OSCIN3) are mounted on the
emulation pod. To use the emulation pod at a frequency other than 16 MHz or 14.318 MHz, build the
desired oscillator circuit on the included OSC-2 oscillator circuit board (bare board) and replace the
board installed in the emulation pod when shipped from the factory.
Figure 3.5 shows an external view of the OSC-2 oscillator circuit board (bare board) and where
connector pins are located. Figure 3.6 shows the circuitry of the OSC-2 oscillator circuit board (bare
board). Use the number of oscillator circuits recommended by the oscillator manufacturer.
Figure 3.5 External view of the oscillator board (OSC-2) and connector pin assignment
J1-4: GND
Figure 3.6 Circuit of the oscillator board (OSC-2)
J1-3: Oscillator output
J1-2: GND
J1-1: VCC (5 V)
* X1: 5.08-mm-pitch 2-pin oscillator IC1: Inverter (Unbuffer)
* X2: 2.54-mm-pitch 2-pin oscillator
* X3: 2.54-mm-pitch 3-pin oscillator
IC1
R1
C2
C1
X1 ,X2
CLK
Vcc
GND
R2
J1-3
1011 8
9
2
1
4
3
65
12
13
C3
IC1
J1-1
J1-2
J1-4
GND
IC
1
**
X3
*
IC1
14
7