mcimx50 Freescale Semiconductor, Inc, mcimx50 Datasheet - Page 96

• Manufacturer Part Number: mcimx50
• Description: I.mx50 Applications Processors For Consumer Products
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
4.9.10.3.1
Figure 57
transmit timing characteristics.
4.9.10.3.2
Figure 58
receive timing characteristics.
96
1
2
1
2
UA3
UA4
UA5
UA6
exceed 3/(16*F
F
F
T
(output)
ID
ID
The UART receiver can tolerate 1/(16*F
(input)
ref_clk
baud_rate
baud_rate
RXD
TXD
: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).
Receive Bit Time
Receive IR Pulse Duration
Transmit Bit Time in IrDA mode
Transmit IR Pulse Duration
depicts the UART IrDA mode transmit timing with 8 data bit/1 stop bit format.
depicts the UART IrDA mode receive timing with 8 data bit/1 stop bit format.
: 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.
UART IrDA Mode Transmitter
Start
Start
Bit
Bit
UART IrDA Mode Receiver
baud_rate
Parameter
Parameter
UA3
UA5
).
1
Bit 0
Bit 0
in IrDA mode
i.MX50 Applications Processors for Consumer Products, Rev. 0
Figure 57. UART IrDA Mode Transmit Timing Diagram
Figure 58. UART IrDA Mode Receive Timing Diagram
Table 70. IrDA Mode Transmit Timing Parameters
Table 71. IrDA Mode Receive Timing Parameters
Bit 1
Bit 1
baud_rate
Symbol
t
Symbol
t
RIRpulse
TIRpulse
t
t
RIRbit
TIRbit
Bit 2
Bit 2
) tolerance in each bit. But accumulation tolerance in one frame must not
UA3
UA5
1/F
(3/16)*(1/F
baud_rate
Bit 3
1/F
Bit 3
baud_rate
2
1.41 μs
baud_rate
– 1/(16*F
Min.
Min
Bit 4
Bit 4
1
– T
) – T
ref_clk
baud_rate
UA4
UA6
Bit 5
ref_clk
Bit 5
2
)
1/F
(3/16)*(1/F
Bit 6
Bit 6
baud_rate
1/F
(5/16)*(1/F
baud_rate
Bit 7
Bit 7
baud_rate
+ 1/(16*F
Max.
Max
Freescale Semiconductor
UA3
UA5
baud_rate
+ T
Table 71
Table 70
) + T
Possible
Possible
ref_clk
Parity
Parity
baud_rate
Bit
Bit
)
ref_clk
UA3
UA5
lists the
)
lists the
STOP
STOP
BIT
BIT
Units
Units
—
—
—
—