MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1531

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

24.2.1 Fractional Baud Rate Divider
The baud rate divisor is calculated from the frequency of UARTCLK and the desired baud
rate by using the following formula:
The divisor must be between 0x00000040 and 0x003FFFC0, inclusive. Program the lowest
6 bits of the divisor into BAUD_DIVFRAC, and the next 16 bits of the divisor into
BAUD_DIVINT.
In the debug UART, HW_UARTDBGLCR_H, HW_UARTDBGIBRD, and
HW_UARTDBGFBRD form a single 30-bit wide register (UARTLCR) that is updated on
a single write strobe generated by an HW_UARTDBGLCR_H write. So, in order to internally
update the contents of HW_UARTDBGIBRD or HW_UARTDBGFBRD, a write to
HW_UARTDBGLCR_H must always be performed at the end.
24.2.2 UART Character Frame
Figure 24-2
24.2.3 Data Transmission or Reception
Data received or transmitted is stored in two 32-byte FIFOs, though the receive FIFO has
an extra four bits per character for status information.
For transmission, data is written into the transmit FIFO. If the Debug UART is enabled, it
causes a data frame to start transmitting with the parameters indicated in UARTLCR_H.
Data continues to be transmitted until there is no data left in the transmit FIFO.
Freescale Semiconductor, Inc.
• Break generation
• Baud rate divisor
divisor = (UARTCLK * 4) / baud rate, rounded to the nearest integer
illustrates the UART character frame.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Figure 24-2. Debug UART Character Frame
1
0
UARTTXD
Start
n
lsb
5 8 data bits
msb
if enabled
Parity bit
stop bits
1 2
Chapter 24 Debug UART (DUART)
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