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型號：	M32185F4VFP
元件分類：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 80 MHz, RISC MICROCONTROLLER, PQFP144
封裝：	20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144
文件頁數(shù)：	247/1032頁
文件大?。?/td>	5750K
代理商：	M32185F4VFP

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Figure 9.3.2 Gaining and Releasing Control of the Internal Bus

One DMA transfer

Internal bus arbitration

(requests from the DMAC)

Internal bus

One DMA transfer

9.3 Functional Description of DMAC

9.3.3 Starting DMA

Use the DMAn Channel Control Register 0 REQSL (DMA transfer request source select) and DMAn Chan-

nel Control Register 1 REQESEL (extended DMA transfer request source select) bits to set the cause or

source of DMA transfer request. To enable DMA, set the TENL (DMA transfer enable) bit to "1." DMA

transfer begins when the specified cause or source of DMA transfer request becomes effective after set-

ting the TENL (DMA transfer enable) bit to "1."

Note: If the transfer request source selected by the REQSL (DMA transfer request source select) and

REQESEL (extended DMA transfer request source select) bits is MJT (TIN input signal), the time

required for DMA transfer to begin after detecting the rising or falling or both edges of the TIN

input signal is three cycles (150 ns when the internal peripheral clock = 20 MHz) at the shortest.

Or, depending on the preceding or following bus usage condition, up to five cycles (250 ns when

the internal peripheral clock = 20 MHz) may be required. (However, this applies when the external

bus, HOLD and the LOCK instruction all are unused.)

To ensure that changes of the TIN input signal state will be detected correctly, make sure the TIN input

signal is held active for a duration of more than 7tc (BCLK)/2. (For details, see Chapter 23 ELECTRI-

CAL CHARACTERISTICS)

9.3.4 DMA Channel Priority

DMA0 has the highest priority. The priority of this and other channels is shown below.

DMA0 > DMA1 > DMA2 > DMA3 > DMA4 > DMA5 > DMA6 > DMA7 > DMA8 > DMA9

This order of priority is fixed and cannot be changed. Among channels on which DMA transfer is re-

quested, the channel that has the highest priority is selected.

9.3.5 Gaining and Releasing Control of Internal Bus

For any channel, control of the internal bus is gained and released in “single transfer DMA” mode. In single

transfer DMA, the DMAC gains control of the internal bus (in one peripheral clock cycle) when DMA trans-

fer request is accepted and after executing one DMA transfer (in one read and one write peripheral clock

cycle), returns bus control to the CPU. The diagram below shows the operation in single transfer DMA.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
M32186F8VFP	制造商:Renesas Electronics Corporation 功能描述:
M3219	功能描述:電纜固定件和配件 LTCG PG-16 BLACK With 3173 NUT RoHS:否制造商:Heyco 類型:Cable Grips, Liquid Tight 材料:Nylon 顏色:Black 安裝方法:Cable 最大光束直徑:11.4 mm 抗拉強(qiáng)度:
M32192F8TFP#U0	制造商:Renesas Electronics Corporation 功能描述:MCU 32-bit M32R RISC 1024KB Flash 3.3V/5V 144-Pin LQFP
M32192F8VFP	制造商:Renesas Electronics Corporation 功能描述:
M321-SERIES	制造商:未知廠家制造商全稱:未知廠家功能描述:Peripheral IC

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