參數(shù)資料
型號(hào): MCIMX281AVM4B
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 454 MHz, RISC PROCESSOR, PBGA289
封裝: 14 X 14 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-289
文件頁數(shù): 54/72頁
文件大?。?/td> 915K
代理商: MCIMX281AVM4B
i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 1
58
Freescale Semiconductor
3.5.15
UART (UARTAPP and DebugUART) AC Timing
This section describes the UART module AC timing which is applicable to both UARTAPP and
DebugUART.
3.5.15.1
UART Transmit Timing
Figure 39 shows the UART transmit timing, showing only eight data bits and one stop bit. Table 63
describes the timing parameter (UA1) shown in the figure.
Figure 42. UART Transmit Timing Diagram
3.5.15.2
UART Receive Timing
Figure 43 shows the UART receive timing, showing only eight data bits and one stop bit. Table 64
describes the timing parameter (UA2) shown in the figure.
Figure 43. UART Receive Timing Diagram
Table 63. UART 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 UARTAPP can support is 3.25 Mbps. The maximum baud rate of
DebugUART is 115.2 kbps.
2 T
ref_clk: The period of UART reference clock ref_clk (which is APBX clock = 24 MHz).
1/Fbaud_rate + Tref_clk
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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