NNDK-MOD5272-KIT NetBurner Inc, NNDK-MOD5272-KIT Datasheet - Page 381
NNDK-MOD5272-KIT
Manufacturer Part Number
NNDK-MOD5272-KIT
Description
KIT DEVELOP NETWORK FOR MOD5272
Manufacturer
NetBurner Inc
Series
ColdFire®r
Datasheets
1.MOD5272-100IR.pdf
(2 pages)
2.MOD5272-100IR.pdf
(550 pages)
3.NNDK-MOD5282-KIT.pdf
(2 pages)
Specifications of NNDK-MOD5272-KIT
Main Purpose
*
Embedded
*
Utilized Ic / Part
MOD5272
Primary Attributes
*
Secondary Attributes
*
Processor To Be Evaluated
MOD5272
Interface Type
RS-232, RS-485, USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
528-1001
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MOTOROLA
Note that when autobaud mode is enabled, the UFPDn, UDUn, and UDLn are
automatically loaded with the calculated baud rate. However, the calculated value can be
overridden by a programmed value at any time.
The choice of URT_CLK or CLKIN is programmed in the UCSR.
16.5.1.2 Calculating Baud Rates
The following sections describe how to calculate baud rates.
16.5.1.2.1 CLKIN Baud Rates
When CLKIN is the UART clocking source, it goes through a divide-by-32 prescaler and
then passes through the 16-bit divider of the concatenated UDUn and UDLn registers. The
UFPD register can be used to improve the accuracy of the clock source as shown in the
following example using a 48 MHz CLKIN and 230kbs UART baud rate:
1. UART Divider = CLKIN / (16 x 2 x UART Baud Rate)
2. The truncation has resulted in an effective 8.7% error (0.52/6)
URT_RxD
URT_CLK
URT_TxD
CLKIN
= 48E06 / (32 x 230E03)
= 6.52
= 6 (truncate to lowest whole number)
UDU = 0x00, UDL = 0x06
Figure 16-23. Clocking Source Diagram
Rx Buffer
Tx Buffer
Tx
Rx
Chapter 16. UART Modules
Clocking sources programmed in UCSR
Generator
Prescaler
Prescaler
Clock
x16
x1
UART
(UFPD)
Divider
4-Bit
(UDU, UDL)
1-Bit Divider
Prescaler
16-Bit
Operation
16-21
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