MCIMX255AJM4AR2 Freescale Semiconductor, MCIMX255AJM4AR2 Datasheet - Page 115

• Manufacturer Part Number: MCIMX255AJM4AR2
• Description: Processors - Application Specialized IMX25 1.2 AUTO
• Manufacturer: Freescale Semiconductor

Specifications of MCIMX255AJM4AR2

• Core: ARM926EJ-S
• Processor Series: MCIMX25
• Maximum Clock Frequency: 400 MHz
• Instruction / Data Cache Memory: 16 KB
• Data Ram Size: 128 KB
• Operating Supply Voltage: 1.15 V to 1.52 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MAPBGA-400
• Interface Type: USB
• Memory Type: DDR2
• Minimum Operating Temperature: - 40 C

3.7.19.1
3.7.19.1.1
Figure 85
bit.
1
2
3.7.19.1.2
Figure 86
Table 87
1
2
Freescale Semiconductor
–
F
T
The UART receiver can tolerate 1/(16
exceed 3/(16
F
ref_clk
baud_rate
baud_rate
UA2
Table 86
(output)
UA1
(input)
ID
ID
RXD
TXD
: The period of UART reference clock ref_clk ( ipg_perclk after RFDIV divider).
describes the timing parameter (UA2) 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.
shows the UART transmit timing in RS-232 serial mode, showing only 8 data bits and 1 stop
describes the timing parameter (UA1) shown in the figure.
UART RS-232 Serial Mode Timing
UART Transmit Timing in RS-232 Serial Mode
UART Receive Timing in RS-232 Serial Mode
F
Transmit Bit Time
baud_rate
Start
Start
UA1
UA2
Bit
Bit
Parameter
Table 86. UART RS-232 Serial Mode Transmit Timing Parameters
Table 87. UART RS-232 Serial Mode Receive Timing Parameters
Figure 85. UART RS-232 Serial Mode Transmit Timing Diagram
Figure 86. UART RS-232 Serial Mode Receive Timing Diagram
).
Receive bit time
Bit 0
Bit 0
i.MX25 Applications Processor for Automotive Products, Rev. 9
Parameter
Bit 1
Bit 1
F
Symbol
baud_rate
1
Bit 2
t
Bit 2
Tbit
) tolerance in each bit. But accumulation tolerance in one frame must not
Bit 3
UA2
Bit 3
UA1
1/F
baud_rate
Bit 4
Bit 4
Symbol
t
Rbit
Min.
1
Bit 5
Bit 5
– T
1/F
ref_clk
baud_rate
Bit 6
Bit 6
F
2
baud_rate
Min.
2
Bit 7
Bit 7
– 1/(16
1/F
)
baud_rate
Possible
Possible
Par Bit
Par Bit
Parity
Parity
UA1
UA2
1/F
Bit
Bit
Max.
baud_rate
F
+ T
baud_rate
STOP
STOP
Max.
UA1
UA2
BIT
BIT
ref_clk
+ 1/(16
)
Next
Start
Next
Start
Bit
Bit
Units
Units
—
—
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