H838024 datasheet(153/697 Pages) RENESAS

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Section 4 Clock Pulse Generators

Rev. 7.00 Mar 10, 2005 page 111 of 652

REJ09B0042-0700

4.3

Subclock Generator

Connecting a 32.768 kHz/38.4 kHz Crystal Oscillator

Clock pulses can be supplied to the subclock divider by connecting a 32.768 kHz/38.4 kHz crystal

oscillator, as shown in figure 4.8. Follow the same precautions as noted under 3. notes on board

design for the system clock in section 4.2.

Note that only operation at 32.768 kHz is guaranteed on the H8/38124 Group.

C = C

= 15 pF (typ.)

Frequency

38.4 kHz

32.768 kHz

Crystal oscillator

Seiko Instruments Inc.

Nihon Denpa Kogyo

Products Name

VTC-200

MX73P

Figure 4.8 Typical Connection to 32.768 kHz/38.4 kHz Crystal Oscillator (Subclock)

Figure 4.9 shows the equivalent circuit of the 32.768 kHz/38.4 kHz crystal oscillator.

LRS

C = 1.5 pF typ

R = 14 k

typ

= 32.768 kHz/38.4 kHz

Ω

Figure 4.9 Equivalent Circuit of 32.768 kHz/38.4 kHz Crystal Oscillator

Pin Connection when Not Using Subclock

When the subclock is not used, connect pin X1 to GND and leave pin X2 open, as shown in figure

4.10.

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