參數(shù)資料
型號: MC9328MX21CJM
廠商: Freescale Semiconductor
文件頁數(shù): 58/100頁
文件大?。?/td> 0K
描述: MPU I.MX21 289-MAPBGA
特色產品: MC9328MX21 Multimedia Processor
標準包裝: 90
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(shù): 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: -40°C ~ 85°C
封裝/外殼: 289-LFBGA
包裝: 托盤
產品目錄頁面: 732 (CN2011-ZH PDF)
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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相關代理商/技術參數(shù)
參數(shù)描述
MC9328MX21CJM 制造商:Freescale Semiconductor 功能描述:IC 32BIT MPU 266MHZ BGA-289
MC9328MX21CJMR2 功能描述:處理器 - 專門應用 DB I.MX21 17X17 RoHS:否 制造商:Freescale Semiconductor 類型:Multimedia Applications 核心:ARM Cortex A9 處理器系列:i.MX6 數(shù)據總線寬度:32 bit 最大時鐘頻率:1 GHz 指令/數(shù)據緩存: 數(shù)據 RAM 大小:128 KB 數(shù)據 ROM 大小: 工作電源電壓: 最大工作溫度:+ 95 C 安裝風格:SMD/SMT 封裝 / 箱體:MAPBGA-432
MC9328MX21CVG 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:i.MX family of microprocessors
MC9328MX21CVH 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:i.MX family of microprocessors
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