Zilog Z16C35 Manual do Utilizador descarregar pdf (Página 50)

100

101

ISCC

User Manual

UM011002-0808

•

Set FM mode WR14.

•

Set FM mode WR10.

3.7 CRYSTAL OSCILLATORS

For a given channel, if bit D7 of WR11 is set to 1, the crystal oscillator is enabled and a

high-gain amplifier is connected between the /RTxC pin and the /SYNC pin. While the

crystal oscillator is enabled, anything that has selected /RTxC as its clock source will auto-

matically be connected to the output of the crystal oscillator. This also makes the /S

YNC

pin unavailable for other use.

In synchronous modes, no sync pulse is output, and the External Sync mode cannot be

selected. In asynchronous modes, the st

ate of the Sync/Hunt bit in RR0 is no longer con-

trolled by the /SYNC pin. Instead, the Sync/Hunt bit is forced to “0.” The crystal oscillator

requires some finite time to stabilize and must be allowed to stabilize before it is used as a

clock source. The External C

rystal used should operate in parallel resonance.

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