- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄370847 > M37640E8 (Mitsubishi Electric Corporation) SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER PDF資料下載
參數(shù)資料
| 型號(hào)： | M37640E8 |
| 廠(chǎng)商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER |
| 中文描述： | 單芯片8位CMOS單片機(jī) |
| 文件頁(yè)數(shù)： | 86/172頁(yè) |
| 文件大?。?/td> | 1193K |
| 代理商： | M37640E8 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)當(dāng)前第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)
2-74
7/9/98
Direct Memory Access Controller
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
2.11.1.4
DMAC Transfer Mode
Each channel of the DMAC can be operated in single-byte transfer mode or burst transfer mode. The
choice is made by the setting of the Channel x DMAC Transfer Mode Selection Bit (DxTMS). When
single-byte transfer mode is selected, one byte of data is transferred per transfer request. When burst
transfer mode is selected, the value in the transfer count register determines how many single byte
transfers occur per transfer request. For example, if the value in the transfer count register is 0014
16
,
21 transfers will occur before control of the address bus and data bus is given back to the CPU.
2.11.1.5
DMAC Transfer Timing
A DMAC transfer can occur at any point during the execution of an instruction by the CPU. However, at
least one cycle of
Φ
with the CPU operating takes place between transfers by the same DMAC channel
caused by different events or between transfers by the two DMAC channels. Also, burst transfers and
possibly single-byte transfers are prevented from occurring during interrupt service routines.
The transfer initiating sources for the two channels are latched by the DMAC asynchronously and
polled on the rising edge of
Φ
. If a transfer request is seen for both channels, the channel 0 request
will be serviced first followed by the channel 1 request.
If channel 1 is performing a burst transfer when channel 0 receives a transfer request, the channel 1
transfer is suspended at the end of the next source read/destination write operation. The channel 0
transfer is then serviced. Once the channel 0 transfer completes, the channel 1 transfer automatically
continues where it left off. In order to prevent channel 0 from completely shutting out channel 1
transfers, one cycle of a suspended channel 1 transfer is allowed to occur after a channel 0 burst
transfer even if another channel 0 transfer request is pending.
If the I flag value is “0” and an interrupt with its interrupt control bit set to a “1” occurs during a
burst transfer by either channel, the transfer is suspended, allowing the interrupt service routine to be
entered. The DMAC Channel x Suspend (due to interrupt service request) Flag (DxSFI) corresponding
to the channel whose transfer was suspended is automatically set to a “1” at this time. When the I
flag value (which was automatically set to a “1” when the interrupt service routine was entered)
becomes a “0” again, the DxSF flag is automatically cleared and the transfer continues where it left
off. If a DMAC burst transfer request occurs during the servicing of an interrupt, the transfer does not
take place until after the interrupt has been serviced, which is understood to have happened when the I
flag becomes a “0”.
If the DMAC Transfer Suspend Control Bit (DTSC) is set to a “1”, both single-byte and burst mode
transfers are suspended by interrupts.
A suspended DMAC transfer can be re-started in the interrupt service routine by writing a “1” to the
DxCEN bit of the suspended channel.
Sample timing diagrams are shown in Figure 2-98, Figure 2-99, and Figure 2-100. for a single-byte
transfer initiated by a hardware source, a single-byte transfer initiated by the software trigger, and a
burst transfer initiated by a hardware source, respectively.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37641F8-XXXFP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8-XXXHP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641M8-XXXFP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641M8 | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37640E8FP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37640E8FS | 功能描述:EPROM MCU/8BIT CMOS EMULATION CH RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類(lèi)型:適配器板 適用于相關(guān)產(chǎn)品:RCB230，RCB231，RCB212 配用:26790D-ND - RCB BREAKOUT BOARD RS232 CABLE |
| M37640M4T | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37640M8-111FP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37640M8-126FP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。