H8SXSLASH1663 datasheet(1016/1158 Pages) RENESAS

Part #	H8SX/1663

Description	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

PDF	1158 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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1016 / 1158 page

Section 22 Clock Pulse Generator

Rev.1.00 Jun. 07, 2006 Page 964 of 1102

REJ09B0294-0100

Figure 22.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator that has

the characteristics shown in table 22.3.

XTAL

AT-cut parallel-resonance type

EXTAL

LRs

Figure 22.3 Crystal Resonator Equivalent Circuit

Table 22.3

Crystal Resonator Characteristics

Frequency (MHz)

S Max. (Ω)

0 Max. (pF)

22.2.2

External Clock Input

An external clock signal can be input as the examples in Figure 22.4. When the XTAL pin is left

open, make the parasitic capacitance less than 10 pF. When the counter clock is input to the XTAL

pin, put the external clock in high level during standby mode.

EXTAL

XTAL

External clock input

Open

(a) XTAL pin left open

EXTAL

XTAL

External clock input

(b) Counter clock input on XTAL pin

Figure 22.4 External Clock Input (Examples)

H8SX/1663 Datasheet(PDF) 1016 Page - Renesas Technology Corp