H8SSLASH2218 datasheet(651/750 Pages) RENESAS

Il numero della parte	H8S/2218

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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Section 19 Clock Pulse Generator

Rev.6.00 Jun. 03, 2008 Page 603 of 698

REJ09B0074-0600

19.6

Subclock Oscillator

19.6.1

Connecting 32.768-kHz Crystal Resonator

supply a clock to the subclock divider, connect a 32.768-kHz crystal resonator, as shown in figure

19.6. Figure 19.7 shows the equivalence circuit for a 32.768-kHz oscillator.

OSC1

OSC2

Note: C

1 and C2 are reference values including the floating

capacitance of the board.

1 = C2 = 15 pF (typ.)

Figure 19.6 Example Connection of 32.768-kHz Quartz Oscillator

OSC1

OSC2

Co = 1.5 pF (typ.)

Rs = 14 k

Ω (typ.)

fw = 32.768 kHz

Type name = C001R (SEIKO EPSON)

Figure 19.7 Equivalence Circuit for 32.768-kHz Oscillator

19.6.2

Handling Pins when Subclock Not Required

If no subclock is required, connect the OSC1 pin to Vss and leave OSC2 open, as shown in figure

19.8. Set the SUBSTP bit of LPWRCR to 1. If this setting is not made, transition to power-down

mode may not complete properly in some cases.

OSC1

OSC2

Open state

Figure 19.8 Pin Handling when Subclock Not Required

H8S/2218 Scheda tecnica(PDF) 651 Page - Renesas Technology Corp