CP3UB26Y98NEPX National Semiconductor, CP3UB26Y98NEPX Datasheet - Page 158

• Manufacturer Part Number: CP3UB26Y98NEPX
• Manufacturer: National Semiconductor

Specifications of CP3UB26Y98NEPX

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 144
• Package Type: LQFP
• Lead Free Status / RoHS Status: Not Compliant

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Data bits are sensed by taking a majority vote of three sam-
ples latched near the midpoint of each baud (bit time). Nor-
mally, the position of the samples within the baud is
determined automatically, but software can override the au-
tomatic selection by setting the USMD bit in the UnMDSL2
register and programming the UnSPOS register.
Serial data input on the RXD pin is shifted into the RSFT
register. On receiving the complete character, the contents
16
16
1
1
Sample
2
2
Figure 67. UART Asynchronous Communication
3
3
STARTBIT
DATABIT
4
4
Figure 66. UART Block Diagram
5
5
6
6
7
7
158
8
8
of the RSFT register are copied into the UnRBUF register
and the Receive Buffer Full bit (URBF) is set. The URBF bit
is automatically cleared when software reads the character
from the URBUF register. The RSFT register is not software
accessible.
9
9
Sample
Sample
10
10
11
11
12
12
13
13
14
14
15
15
16
16
DATA (LSB)
DS061
1
1