MCIMX255AJM4AR2 Freescale Semiconductor, MCIMX255AJM4AR2 Datasheet - Page 116

• 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

3.7.19.2
The following subsections describe the UART transmit and receive timing in IrDA mode.
3.7.19.2.3
Figure 87
Table 88
1
2
3.7.19.2.4
Figure 88
Table 89
1
116
UA5
UA6
UA3
UA4
F
T
ID
The UART receiver can tolerate 1/(16
exceed 3/(16
(output)
ID
ref_clk
baud_rate
(input)
RXD
TXD
Receive bit time
: The period of UART reference clock ref_clk ( ipg_perclk after RFDIV divider).
Transmit bit time in IrDA mode
Receive IR pulse duration
describes the timing parameters (UA3–UA4) shown in the figure.
describes the timing parameters (UA5–UA6) shown in the figure.
: Baud rate frequency. The maximum baud rate the UART can support is ( ipg_perclk frequency)/16.
depicts the UART transmit timing in IrDA mode, showing only 8 data bits and 1 stop bit.
shows the UART receive timing for IrDA mode, for a format of 8 data bits and 1 stop bit.
Transmit IR pulse duration
UART Infrared (IrDA) Mode Timing
Start
Start
Bit
Bit
UART IrDA Mode Transmit Timing
UART IrDA Mode Receive Timing
F
Parameter
baud_rate
Parameter
UA3
UA5
1
in IrDA mode
Bit 0
Bit 0
).
i.MX25 Applications Processor for Automotive Products, Rev. 9
Table 88. UART IrDA Mode Transmit Timing Parameters
Table 89. UART IrDA Mode Receive Timing Parameters
Figure 87. UART IrDA Mode Transmit Timing Diagram
Figure 88. UART IrDA Mode Receive Timing Diagram
Bit 1
Bit 1
Symbol
t
RIRpulse
t
F
RIRbit
baud_rate
Symbol
t
TIRpulse
t
TIRbit
Bit 2
Bit 2
1/F
UA3
UA5
) tolerance in each bit. But accumulation tolerance in one frame must not
(3/16)
baud_rate
1/F
Bit 3
Bit 3
baud_rate
2
(1/F
1.41 s
– 1/(16
Min.
baud_rate
Min.
Bit 4
Bit 4
1
– T
F
ref_clk
) – T
baud_rate
UA4
UA6
Bit 5
Bit 5
ref_clk
2
) 1/F
(3/16)
Bit 6
Bit 6
baud_rate
1/F
(5/16)
baud_rate
(1/F
+ 1/(16
Bit 7
Bit 7
baud_rate
Max.
Max.
(1/F
Freescale Semiconductor
UA3
UA5
+ T
baud_rate
ref_clk
) + T
Possible
Possible
F
Parity
Parity
baud_rate
Bit
Bit
ref_clk
)
UA3
UA5
)
STOP
STOP
Units
BIT
BIT
Units
—
—
—
—