AT94K05AL-25AQC Atmel, AT94K05AL-25AQC Datasheet - Page 136
AT94K05AL-25AQC
Manufacturer Part Number
AT94K05AL-25AQC
Description
Manufacturer
Atmel
Datasheet
1.AT94K05AL-25AQC.pdf
(204 pages)
Specifications of AT94K05AL-25AQC
Device System Gates
5000
Propagation Delay Time
12.1ns
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
3V
Operating Temperature Classification
Commercial
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Mounting
Surface Mount
Pin Count
100
Package Type
PQFP
Lead Free Status / RoHS Status
Not Compliant
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4.29.5
136
AT94KAL Series FPSLIC
Baud-rate Generator
• Bit 3 - TXEN0/TXEN1: Transmitter Enable
This bit enables the UART transmitter when set (one). When disabling the transmitter while
transmitting a character, the transmitter is not disabled before the character in the shift register
plus any following character in UDRn has been completely transmitted.
• Bit 2 - CHR90/CHR91: 9-bit Characters
When this bit is set (one) transmitted and received characters are 9-bit long plus start and stop
bits. The 9-bit is read and written by using the RXB8n and TXB8n bits in UCSRnB, respectively.
The 9th data bit can be used as an extra stop bit or a parity bit.
• Bit 1 - RXB80/RXB81: Receive Data Bit 8
When CHR9n is set (one), RXB8n is the 9th data bit of the received character.
• Bit 0 - TXB80/TXB81: Transmit Data Bit 8
When CHR9n is set (one), TXB8n is the 9th data bit in the character to be transmitted.
The baud-rate generator is a frequency divider which generates baud-rates according to the fol-
lowing equation
Note:
For standard crystal frequencies, the most commonly used baud-rates can be generated by
using the UBR settings in
than 2% from the target baud-rate, are bold in the table. However, using baud-rates that have
more than 1% error is not recommended. High error ratings give less noise resistance.
• BAUD = Baud-rate
• f
• UBR = Contents of the UBRRHI and UBRRn Registers, (0 - 4095)
CK
= Crystal Clock Frequency
1. This equation is not valid when the UART transmission speed is doubled. See
Transmission” on page 138
(1)
:
Table
2. UBR values which yield an actual baud-rate differing less
BAUD
for a detailed description.
=
--------------------------------- -
16(UBR
f
CK
+
1 )
“Double Speed
1138I–FPSLI–1/08
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