mcimx50 Freescale Semiconductor, Inc, mcimx50 Datasheet - Page 95

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

4.9.10.2.1
Figure 55
format.
4.9.10.2.2
Figure 56
serial mode receive timing characteristics.
4.9.10.3 UART IrDA Mode Timing
The following sections give the UART transmit and receive timings in IrDA mode.
Freescale Semiconductor
1
2
1
2
The UART receiver can tolerate 1/(16*F
exceed 3/(16*F
F
UA2
(output)
ID
baud_rate
F
T
(input)
RXD
TXD
ref_clk
baud_rate
UA1
ID
Table 68
: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).
depicts the transmit timing of UART in the RS-232 serial mode with 8 data bit/1 stop bit
depicts the RS-232 serial 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.
Receive Bit Time
UART Transmitter
UART Receiver
Transmit Bit Time
baud_rate
Parameter
Start
Start
UA1
UA2
Bit
Bit
lists the UART RS-232 serial mode transmit timing characteristics.
Parameter
Figure 55. UART RS-232 Serial Mode Transmit Timing Diagram
Figure 56. UART RS-232 Serial Mode Receive Timing Diagram
).
Bit 0
Table 68. RS-232 Serial Mode Transmit Timing Parameters
Bit 0
Table 69. RS-232 Serial Mode Receive Timing Parameters
i.MX50 Applications Processors for Consumer Products, Rev. 0
1
Bit 1
Bit 1
Symbol
t
Rbit
baud_rate
Bit 2
Bit 2
Symbol
t
Tbit
1/F
) tolerance in each bit. But accumulation tolerance in one frame must not
Bit 3
UA2
Bit 3
baud_rate
UA1
1/F
Bit 4
Bit 4
2
baud_rate
– 1/(16*F
Min
Min
Bit 5
Bit 5
1
baud_rate
– T
ref_clk
Bit 6
Bit 6
)
2
1/F
Bit 7
Bit 7
baud_rate
1/F
baud_rate
Possible
Possible
Par Bit
Par Bit
Parity
Parity
UA1
UA2
Bit
Bit
Max
+ 1/(16*F
Max
+ T
Electrical Characteristics
STOP
STOP
UA1
UA2
BIT
BIT
ref_clk
baud_rate
Table 69
Next
Start
Next
Start
Bit
Bit
)
Units
—
Units
lists
—
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