MCIMX251AVM4 Freescale Semiconductor, MCIMX251AVM4 Datasheet - Page 116
MCIMX251AVM4
Manufacturer Part Number
MCIMX251AVM4
Description
IC MPU I.MX25 AUTO 400MAPBGA
Manufacturer
Freescale Semiconductor
Series
i.MX25r
Datasheet
1.MCIMX255AJM4.pdf
(140 pages)
Specifications of MCIMX251AVM4
Core Processor
ARM9
Core Size
32-Bit
Speed
400MHz
Connectivity
1-Wire, CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
Peripherals
DMA, I²S, POR, PWM, WDT
Number Of I /o
128
Program Memory Type
External Program Memory
Ram Size
144K x 8
Voltage - Supply (vcc/vdd)
1.15 V ~ 1.52 V
Data Converters
A/D 3x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
400-LFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCIMX251AVM4
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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1
2
3.7.19.1.2
Figure 86
Table 87
1
2
3.7.19.2
The following subsections describe the UART transmit and receive timing in IrDA mode.
3.7.19.2.3
Figure 87
Table 88
116
–
F
T
Note: The UART receiver can tolerate 1/(16 × F
not exceed 3/(16 × F
F
(output)
ref_clk
baud_rate
baud_rate
UA2
TXD
UA1
(input)
ID
ID
RXD
: The period of UART reference clock ref_clk ( ipg_perclk after RFDIV divider).
describes the timing parameter (UA2) shown in the figure.
describes the timing parameters (UA3–UA4) shown in the figure.
: Baud rate frequency. The maximum baud rate the UART can support is ( ipg_perclk frequency)/16.
: Baud rate frequency. The maximum baud rate the UART can support is ( ipg_perclk frequency)/16.
shows the UART receive timing in RS-232 serial mode, showing only 8 data bits and 1 stop bit.
depicts the UART transmit timing in IrDA mode, showing only 8 data bits and 1 stop bit.
UART Infrared (IrDA) Mode Timing
Start
Bit
UART Receive Timing in RS-232 Serial Mode
UART IrDA Mode Transmit Timing
Transmit Bit Time
Start
UA2
Bit
UA3
Parameter
baud_rate
Table 86. UART RS-232 Serial Mode Transmit Timing Parameters
Table 87. UART RS-232 Serial Mode Receive Timing Parameters
Figure 86. UART RS-232 Serial Mode Receive Timing Diagram
Bit 0
Receive bit time
Bit 0
i.MX25 Applications Processor for Automotive Products, Rev. 8
Parameter
).
Figure 87. UART IrDA Mode Transmit Timing Diagram
Bit 1
Bit 1
Symbol
1
t
Bit 2
Tbit
Bit 2
baud_rate
UA3
UA2
Bit 3
1/F
) tolerance in each bit. But accumulation tolerance in one frame must
Bit 3
baud_rate
Bit 4
Symbol
t
Rbit
Min.
1
Bit 4
Bit 5
– T
1/F
ref_clk
baud_rate
× F
Bit 6
UA4
2
Bit 5
baud_rate
Min.
2
Bit 7
– 1/(16
1/F
)
Bit 6
baud_rate
Possible
Par Bit
Parity
UA2
1/F
Bit
Max.
baud_rate
× F
Bit 7
+ T
baud_rate
STOP
Max.
Freescale Semiconductor
UA2
BIT
UA3
ref_clk
+ 1/(16
Possible
)
Parity
Bit
Next
Start
Bit
UA3
Units
Units
—
STOP
—
BIT
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