MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 58

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• 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: Supplier Unconfirmed

3.4.15
This section describes the UART module AC timing which is applicable to both UARTAPP and
DebugUART.
3.4.15.1
Figure 39
describes the timing parameter (UA1) shown in the figure.
1
2
3.4.15.2
Figure 43
describes the timing parameter (UA2) shown in the figure.
58
–
F
DebugUART is 115.2 kbps.
T
ref_clk
baud_rate
(output)
UA1
(input)
ID
RXD
TXD
: The period of UART reference clock ref_clk (which is APBX clock = 24 MHz).
: Baud rate frequency. The maximum baud rate the UARTAPP can support is 3.25 Mbps. The maximum baud rate of
shows the UART transmit timing, showing only eight data bits and one stop bit.
shows the UART receive timing, showing only eight data bits and one stop bit.
UART (UARTAPP and DebugUART) AC Timing
UART Transmit Timing
UART Receive Timing
Transmit Bit Time
Start
Start
UA1
UA2
Bit
Bit
Parameter
i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 0
Bit 0
Bit 0
Bit 1
Bit 1
Table 62. UART Transmit Timing Parameters
Figure 42. UART Transmit Timing Diagram
Figure 43. UART Receive Timing Diagram
Symbol
Bit 2
t
Bit 2
Tbit
Bit 3
UA2
Bit 3
UA1
1/F
baud_rate
Bit 4
Bit 4
Min.
1
Bit 5
Bit 5
– T
ref_clk
Bit 6
Bit 6
2
Bit 7
Bit 7
1/F
baud_rate
Possible
Possible
Par Bit
Par Bit
Parity
Parity
UA1
UA2
Bit
Bit
Max.
+ T
STOP
STOP
Freescale Semiconductor
UA1
UA2
BIT
BIT
ref_clk
Table 63
Table 62
Next
Start
Next
Start
Bit
Bit
Units
—