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参数资料
| 型号： | MC9328MX21VH |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 266 MHz, MICROPROCESSOR, PBGA289 |
| 封装： | 17 X 17 MM, 1.45 MM HEIGHT, 0.80 MM PITCH, MAPBGA-289 |
| 文件页数： | 66/106页 |
| 文件大小： | 1932K |
| 代理商： | MC9328MX21VH |
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MC9328MX21 Product Preview, Rev. 1.1
62
Freescale Semiconductor
Specifications
Figure 46. 1-Wire Initialization
The reset pulse begins the initialization sequence and it is initiated when the RPP control register bit is set.
When the presence pulse is detected, this bit will be cleared. The presence pulse is used by the bus master
to determine if at least one DS2502 is connected. Software will determine if more than one DS2502 exists.
The one-wire will sample for the DS2502 presence pulse. The presence pulse is latched in the one-wire
control register PST. When the PST bit is set to a one, it means that a DS2502 is present; if the bit is set to
a zero, then no device was found.
3.17.2
Write 0
The Write 0 function simply writes a zero bit to the DS2502. The sequence takes 117 us. The one-wire bus
is held low for 100us.
Figure 47. Write 0 Timing
The Write 0 pulse sequence is initiated when the WR0 control bit register is set. When the write is
complete, the WR0 register will be auto cleared.
3.17.3
Write 1/Read Data
The Write 1 and Read timing is identical. The time slot is first driven low. According to the DS2502
documentation, the DS2502 has a delay circuit which is used to synchronize the DS2502 with the bus
master (one-wire). This delay circuit is triggered by the falling edge of the data line and is used to decide
when the DS2502 should sample the line. In the case of a write 1 or read 1, after a delay, a 1 will be
transmitted / received. When a read 0 slot is issued, the delay circuit will hold the data line low to override
the 1 generated by the bus master (one-wire).
For the Write 1 or Read, the control register WR1/RD is set and auto-cleared when the sequence has been
completed. After a Read, the control register RDST bit is set to the value of the read.
one-wire
DS2502
waits
15-60us
DS2502 Tx
“presence pulse”
60-240us
68us
BUS
Reset and Presence Pulses
One-Wire samples (set PST)
512us
AutoClear RPP
Control Bit
Set RPP
511 us
100us
one-wire
17us
BUS
Write 0 Slot 128us
AutoClear WR0
Set WR0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC9328MX21VK | 功能描述:处理器 - 专门应用 DB I.MX21 PB-FR RoHS:否 制造商:Freescale Semiconductor 类型:Multimedia Applications 核心:ARM Cortex A9 处理器系列:i.MX6 数据总线宽度:32 bit 最大时钟频率:1 GHz 指令/数据缓存: 数据 RAM 大小:128 KB 数据 ROM 大小: 工作电源电压: 最大工作温度:+ 95 C 安装风格:SMD/SMT 封装 / 箱体:MAPBGA-432 |
| MC9328MX21VK | 制造商:Freescale Semiconductor 功能描述:Microprocessor |
| MC9328MX21VKR2 | 功能描述:处理器 - 专门应用 DB I.MX21 PB-FR RoHS:否 制造商:Freescale Semiconductor 类型:Multimedia Applications 核心:ARM Cortex A9 处理器系列:i.MX6 数据总线宽度:32 bit 最大时钟频率:1 GHz 指令/数据缓存: 数据 RAM 大小:128 KB 数据 ROM 大小: 工作电源电压: 最大工作温度:+ 95 C 安装风格:SMD/SMT 封装 / 箱体:MAPBGA-432 |
| MC9328MX21VM | 功能描述:处理器 - 专门应用 DB I.MX21 17X17 PB-FR RoHS:否 制造商:Freescale Semiconductor 类型:Multimedia Applications 核心:ARM Cortex A9 处理器系列:i.MX6 数据总线宽度:32 bit 最大时钟频率:1 GHz 指令/数据缓存: 数据 RAM 大小:128 KB 数据 ROM 大小: 工作电源电压: 最大工作温度:+ 95 C 安装风格:SMD/SMT 封装 / 箱体:MAPBGA-432 |
| MC9328MX21VM | 制造商:Freescale Semiconductor 功能描述:Microprocessor |
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