TP3420AV National Semiconductor, TP3420AV Datasheet - Page 23

• Manufacturer Part Number: TP3420AV
• Manufacturer: National Semiconductor

Specifications of TP3420AV

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Package Type: PLCC
• Lead Free Status / Rohs Status: Not Compliant

Typical Applications
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
FIGURE 8. TP3420A Alternate MICROWIRE Clock Format
FIGURE 7. TP3420A Normal MICROWIRE Clock Format
(Continued)
23
2. CCLK idling HIGH when the CS pin is inactive HIGH,
positive edge of CCLK. This format (shown in Figure 7 )
is normally used with NSC’s microcontrollers from the
HPC or the COP8 family.
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.
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