參數(shù)資料
型號: MCIMX258CVM4
廠商: Freescale Semiconductor
文件頁數(shù): 19/153頁
文件大?。?/td> 0K
描述: IC MPU I.MX25 IND 400MAPBGA
標準包裝: 90
系列: i.MX25
核心處理器: ARM9
芯體尺寸: 32-位
速度: 400MHz
連通性: 1 線,CAN,EBI/EMI,以太網(wǎng),I²C,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外圍設備: DMA,I²S,LCD,POR,PWM,WDT
輸入/輸出數(shù): 128
程序存儲器類型: 外部程序存儲器
RAM 容量: 144K x 8
電壓 - 電源 (Vcc/Vdd): 1.15 V ~ 1.52 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 3x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 400-LFBGA
包裝: 托盤
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 10
Freescale Semiconductor
115
3.7.19.1
UART RS-232 Serial Mode Timing
3.7.19.1.1
UART Transmit Timing in RS-232 Serial Mode
Figure 85 shows the UART transmit timing in RS-232 serial mode, showing only 8 data bits and 1 stop
bit. Table 86 describes the timing parameter (UA1) shown in the figure.
Figure 85. UART RS-232 Serial Mode Transmit Timing Diagram
3.7.19.1.2
UART Receive Timing in RS-232 Serial Mode
Figure 86 shows the UART receive timing in RS-232 serial mode, showing only 8 data bits and 1 stop bit.
Table 87 describes the timing parameter (UA2) shown in the figure.
Figure 86. UART RS-232 Serial Mode Receive Timing Diagram
Table 86. UART 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 87. UART 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 × Fbaud_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
× Fbaud_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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