MCF5272CVF66J Freescale Semiconductor, MCF5272CVF66J Datasheet - Page 381
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MCF5272CVF66J
Manufacturer Part Number
MCF5272CVF66J
Description
IC MCU 166MHZ 196MAPBGA
Manufacturer
Freescale Semiconductor
Series
MCF527xr
Specifications of MCF5272CVF66J
Core Processor
Coldfire V2
Core Size
32-Bit
Speed
66MHz
Connectivity
EBI/EMI, Ethernet, I²C, SPI, UART/USART, USB
Peripherals
DMA, WDT
Number Of I /o
32
Program Memory Size
16KB (4K x 32)
Program Memory Type
ROM
Ram Size
1K x 32
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
196-MAPBGA
Processor Series
MCF527x
Core
ColdFire V2
3rd Party Development Tools
JLINK-CF-BDM26, EWCF
Development Tools By Supplier
NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
Leaded Process Compatible
No
Rohs Compliant
No
Peak Reflow Compatible (260 C)
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
No
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCF5272CVF66J
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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to improve the accuracy of the clock source as shown in the following example using a 48 MHz CLKIN
and 230kbs UART baud rate:
16.5.1.2.2
An external source clock (URT_CLK) can be used as is or divided by 16.
16.5.1.2.3
The UART can determine the clock rate of a received character stream from the timing of the received
pattern. If UCRn[ENAB] is set, the autobaud detector searches for a low level on URT_RxD, indicating a
start bit. Start-bit length is measured until URT_RxD returns to a high level, then the transmission rate is
calculated and loaded into UDUn, UDLn, and UFPDn.
The calculated transmission rate can be determined by reading UABUn and UABLn. Errors may occur in
the calculation of high transmission rates due to distortion effects from the external drivers. If the
calculated rate is inaccurate, UDUn, UDLn, and UFPDn must be written with the appropriate value as soon
as possible to ensure that characters are properly received by the UART. The first character is always
correctly captured, even though the transmission rate is not yet calculated.
The first character must be an odd character such as ‘a’ or ‘A’ to ensure that it contains an isolated start
bit. The parity mode can be determined by monitoring subsequent characters.
The process for using the autobaud detector is as follows:
Freescale Semiconductor
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)
3. Using the formula Fractional Divider = (truncated remainder * 16)
4. This now gives an effective total error in the baud rate as:
•
•
•
•
UDUn, UDLn, and UFPDn must be initialized to 0x00.
The receiver and transmitter clock sources must be set to TIMER (UCSR = 0xDD).
Autobaud must be enabled (UCR[ENAB] = 1).
The receiver must be enabled (UCR[RC] = 01).
%Error = 100 x (Truncated remainder) / (16 x (UD + UFPD/16)]
External Clock
Autobaud Detection
MCF5272 ColdFire
= 48E06 / (32 x 230E03)
= 6.52
= 6 (truncate to lowest whole number)
UDU = 0x00, UDL = 0x06
= 0.52 * 16
= 8.32
= 8 (truncate to nearest whole number)
UFPD = 0x08
= 100 x 0.32 / (16 x (6 + 8/16))
= 32 / 104
= 0.31%
Baudrate
®
Integrated Microprocessor User’s Manual, Rev. 3
=
Externalclockfrequency
-------------------------------------------------------------------- -
16or1
UART Modules
16-21
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