H8SSLASH2225 datasheet(857/1071 Pages) RENESAS

857 / 1071 page

Section 23 Clock Pulse Generator

Rev. 5.00 Aug 08, 2006 page 771 of 982

REJ09B0054-0500

Table 23.1 Damping Resistance Value

Frequency (MHz)

16*

20*

Rd (

Ω)

1 k

500

300

200

100

Notes: 1. The H8S/2258 Group is out of operation.

2. Supported only by the H8S/2239 Group.

Figure 23.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has

the characteristics shown in table 23.2.

XTAL

AT-cut parallel-resonance type

EXTAL

LRs

Figure 23.3 Crystal Resonator Equivalent Circuit

Table 23.2 Crystal Resonator Characteristics

Frequency (MHz)

16*

20*

RS max (

Ω)

500

120

100

C0 max (pF)

777

Notes: 1. The H8S/2258 Group is out of operation.

2. Supported only by the H8S/2239 Group.

23.2.2

External Clock Input

An external clock signal can be input as shown in the examples in figure 23.4. If the XTAL pin is

left open, ensure that stray capacitance does not exceed 10 pF. When complementary clock is

input to the XTAL pin, the external clock input should be fixed high in standby mode, subactive

mode, subsleep mode, or watch mode.

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