z16c30 ZiLOG Semiconductor, z16c30 Datasheet - Page 48

• Manufacturer Part Number: z16c30
• Description: Cmos Usc Universal Serial Controller
• Manufacturer: ZiLOG Semiconductor

DS007902-0708
Character Counters
DIFFERENTIAL
BI-PHASE-M
BIPHASE-S
BIPHASE-L
BIPHASE-L
NRZI-M
Differential Biphase-Level—
tion at the center of the bit cell, with the opposite polarity from the transition at the center
of the preceding bit cell. A 0 is represented by a transition at the center of the bit cell with
the same polarity as the transition at the center of the preceding bit cell. In both cases there
may be transitions at the beginning of the bit cell to set up the level required to make the
correct center transition.
Each channel in the USC contains a 16-bit character counter for both receiver and trans-
mitter. The receive character counter may be preset either under software control or auto-
matically at the beginning of a receive message. The counter decrements with each receive
character and at the end of the receive message the current value in the counter is automat-
NRZI-S
NRZB
Data
NRZ
1
1
P R E L I M I N A R Y
In Differential Biphase-Level, a 1 is represented by a transi-
Figure 28. Data Encoding
0
0
1
Product Specification
Functional Description
0
Z16C30
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