TP3420AV datasheet(23/32 Pages) NSC

Il numero della parte	TP3420AV

Spiegazioni elettronici	ISDN S/T Interface Device

PDF	32 Pages

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Produttore elettronici	NSC [National Semiconductor (TI)]

Homepage	http://www.national.com

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23 / 32 page

Typical Applications (Continued)

POPULAR MICROWIRE FORMATS

The TP3420A enhanced MICROWIRE port supports two

popular formats used in typical terminal equipment applica-

tions.

CCLK idling LOW when the CS pin is inactive HIGH,

pulsing LOW/HIGH/LOW for 8 clocks then returning

back to LOW for idle condition. Data is output on the CO

pin on the negative edge and data is sampled in on the

positive edge of CCLK. This format (shown in

Figure 7)

is normally used with NSC’s microcontrollers from the

HPC or the COP8 family.

CCLK idling HIGH when the CS pin is inactive HIGH,

pulsing HIGH/LOW/HIGH for 8 clocks, then returning

back to HIGH for idle condition. Data is output on the CO

pin on the negative edge and data sampled in on the

positive edge of CCLK. This format (shown in

Figure 8)

is normally used with other alternate microcontrollers in

the industry.

DS009143-24

FIGURE 7. TP3420A Normal MICROWIRE Clock Format

DS009143-25

FIGURE 8. TP3420A Alternate MICROWIRE Clock Format

TP3420AV Scheda tecnica(PDF) 23 Page - National Semiconductor (TI)