HD64F2149YV datasheet(766/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Section 23 Clock Pulse Generator

Rev. 3.00 Jan 18, 2006 page 738 of 1044

REJ09B0280-0300

23.3

Oscillator

Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.

23.3.1

Connecting a Crystal Resonator

Circuit Configuration: A crystal resonator can be connected as shown in the example in figure

23.2. Select the damping resistance R

d according to table 23.2. An AT-cut parallel-resonance

crystal should be used.

EXTAL

XTAL

CL2

CL1

CL1 = CL2 = 10 to 22pF

Figure 23.2 Connection of Crystal Resonator (Example)

Table 23.2

Damping Resistance Value

Frequency (MHz)

24810

d (Ω)

500

200

Crystal resonator: Figure 23.3 shows the equivalent circuit of the crystal resonator. Use a crystal

resonator that has the characteristics shown in table 23.3 and the same frequency as the system

clock (

φ).

XTAL

AT-cut parallel-resonance type

EXTAL

LRs

Figure 23.3 Crystal Resonator Equivalent Circuit

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