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5. Oscillator Circuit
5.1 Oscillator Circuit Board
The M38C29T-ADF has a built-in oscillator circuit board on which a 4.0MHz oscillator is mounted.
Figure 5.1 shows an external view of the OSC-2 oscillator circuit board (bare board) and where connector pins are located. Figure 5.2
shows the circuitry of the OSC-2 oscillator circuit board (bare board). Use the number of oscillator circuits recommended by the
oscillator manufacturer.
J1-4: GND
J1-3: Oscillation output
J1-2: GND
J1-1: VCC
Figure 5.1 External view of the oscillator board (OSC-2) and connector pin assignment
IC1
R1
C2
C1
X1 ,X2
CLK
Vcc
GND
R2
J1-3
1011 89
21
43
65
1213
IC1:Inverter (Unbuffer)
X1:5.08-mm-pitch 2-pin oscillator
X2:2.54-mm-pitch 2-pin oscillator
X3:2.54-mm-pitch 3-pin oscillator
C3
IC1
J1-1
J1-2
J1-4
GND
IC1
**
X3
*
*.
IC1
14
7
Figure 5.2 Circuit of the oscillator board (OSC-2)
5.2 32.768kHz Oscillator Circuit
The 32.768kHz oscillator circuit is prepared on the M38C29T-ADF. When using the 32.768kHz oscillator circuit as a sub-clock, set
SW1 to the XCIN side.