Renesas Single-Chip Microcomputer M38C89T-ADF - Manual (Page 12)

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5.3 How to Use the RC Oscillator Circuit
The clock selection circuit is shown in Figure 5.3. Oscillation can be switched between RC oscillation
and the oscillator by changing the jumpers. The following procedure explains how to switch to RC
oscillation.
(1) Cut jumper JP4. (When JP4 is cut, the OSCSEL pin becomes high.)
(2) To enable RC oscillation in IC1, set resistor R1 (see Table 4.3) in jumpers JP1 and JP2
described in Figure 5.1. To enable RC oscillation in IC2, set resistor R10 (see Table 4.1) in
jumpers JP5 and JP6 described in Figure 5.1.
Figure 5.3 Clock selection circuit
6. Reset Circuit
Figure 6.1 shows the reset circuit. The reset circuit is common for IC1 and IC2.
Figure 6.1 Reset circuit
7. LCD Bias Circuit
Figure 7.1 shows the LCD bias circuit. The parts are not mounted.
Figure 7.1 LCD bias circuit