參數資料
型號: MC9328MX21DVKR2
廠商: Freescale Semiconductor
文件頁數: 58/100頁
文件大?。?/td> 0K
描述: IC MCU I.MX21 266MHZ 289-MAPBGA
標準包裝: 1,000
系列: i.MX21
核心處理器: ARM9
芯體尺寸: 32-位
速度: 266MHz
連通性: 1 線,EBI/EMI,I²C,IrDA,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: 192
程序存儲器類型: ROMless
電壓 - 電源 (Vcc/Vdd): 1.45 V ~ 3.3 V
振蕩器型: 外部
工作溫度: -30°C ~ 70°C
封裝/外殼: 289-LFBGA
包裝: *
MC9328MX21 Technical Data, Rev. 3.4
60
Freescale Semiconductor
Specifications
Figure 49. Read Timing
The precision of the generated clock is very important to get a proper behavior of the one-wire module.
This module is based on a state machine which undertakes actions at defined times.
The most stringent constraint is 0.0645 as a relative time imprecision.
The time relative precision is directly derived from the frequency of the derivative clock (f):
Time relative precision = 1/f -1 = divider/clock (MHz) - 1
The Figure 39 gathers relative time precision for different main clock frequencies.
This shows that the user should take care of the main clock frequency when using the one-wire module. If
the main clock is an exact integer multiple of 1 MHz, then the generated frequency will be exactly 1 MHz.
NOTE
A main clock frequency below 10 MHz might cause a misbehavior of the module.
Table 38. System Timing Requirements
Times
Values
(Microsec)
Minimum
(Microsec)
Maximum
(microsec)
Absolute
Precision
Relative
Precision
RSTL
511
480
31
0.0645
PST
68
60
75
7
0.1
RSTH
512
480
32
0.0645
LOW0
100
60
120
20
0.2
LOWR
5
1
15
4
0.8
READ_sample
13
15
2
0.15
Table 39. System Clock Requirements
Main Clock Frequency (MHz)
13
16.8
19.44
Clock divide ratio
13
17
19
Generated frequency (MHz)
1
0.9882
1.023
Relative time imprecision
0
0.0117
0.023
60us
one-wire
5us
BUS
Read Timing
Read “0” Slot 117us
Read “1” Slot 117us
13us
5us
13us
One-Wire samples
Set WR1/RD
Auto Clear WR1/RD Set WR1/RD
Auto Clear WR1/RD
(set RDST)
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