參數(shù)資料
型號: MCIMX507CVM8B
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PBGA400
封裝: 17 X 17 MM, 0.5 MM PITCH, ROHS COMPLIANT, PLASTIC, MABGA-400
文件頁數(shù): 116/120頁
文件大?。?/td> 1980K
代理商: MCIMX507CVM8B
Electrical Characteristics
i.MX50 Applications Processors for Consumer Products, Rev. 0
Freescale Semiconductor
95
4.9.10.2.1
UART Transmitter
Figure 55 depicts the transmit timing of UART in the RS-232 serial mode with 8 data bit/1 stop bit
format. Table 68 lists the UART RS-232 serial mode transmit timing characteristics.
Figure 55. UART RS-232 Serial Mode Transmit Timing Diagram
4.9.10.2.2
UART Receiver
Figure 56 depicts the RS-232 serial mode receive timing with 8 data bit/1 stop bit format. Table 69 lists
serial mode receive timing characteristics.
Figure 56. UART RS-232 Serial Mode Receive Timing Diagram
4.9.10.3
UART IrDA Mode Timing
The following sections give the UART transmit and receive timings in IrDA mode.
Table 68. RS-232 Serial Mode Transmit Timing Parameters
ID
Parameter
Symbol
Min
Max
Units
UA1
Transmit Bit Time
tTbit
1/Fbaud_rate
1 –T
ref_clk
2
1 F
baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.
2 T
ref_clk: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).
1/Fbaud_rate +Tref_clk
Table 69. RS-232 Serial Mode Receive Timing Parameters
ID
Parameter
Symbol
Min
Max
Units
UA2
Receive Bit Time1
1 The UART receiver can tolerate 1/(16*F
baud_rate) tolerance in each bit. But accumulation tolerance in one frame must not
exceed 3/(16*Fbaud_rate).
tRbit
1/Fbaud_rate
2 – 1/(16*F
baud_rate)
2 F
baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.
1/Fbaud_rate + 1/(16*Fbaud_rate)—
Bit 1
Bit 2
Bit 0
Bit 4
Bit 5
Bit 6
Bit 7
TXD
(output)
Bit 3
Start
Bit
STOP
BIT
Next
Start
Bit
Possible
Parity
Bit
Par Bit
UA1
Bit 1
Bit 2
Bit 0
Bit 4
Bit 5
Bit 6
Bit 7
RXD
(input)
Bit 3
Start
Bit
STOP
BIT
Next
Start
Bit
Possible
Parity
Bit
Par Bit
UA2
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