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TP3420AV Datasheet(PDF) 23 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # TP3420AV
Description  ISDN S/T Interface Device
PDF  32 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

TP3420AV Datasheet(HTML) 23 Page - National Semiconductor (TI)

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Typical Applications (Continued)
POPULAR MICROWIRE FORMATS
The TP3420A enhanced MICROWIRE port supports two
popular formats used in typical terminal equipment applica-
tions.
1.
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.
2.
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
www.national.com
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