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參數(shù)資料
| 型號： | M306N5MCT-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 36/63頁 |
| 文件大?。?/td> | 825K |
| 代理商： | M306N5MCT-XXXGP |
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DMAC
Mitsubishi microcomputers
M16C / 62A Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
66
DMA enable bit
Setting the DMA enable bit to "1" makes the DMAC active. The DMAC carries out the following operations
at the time data transfer starts immediately after DMAC is turned active.
(1) Reloads the value of one of the source pointer and the destination pointer - the one specified for the
forward direction - to the forward direction address pointer.
(2) Reloads the value of the transfer counter reload register to the transfer counter.
Thus overwriting "1" to the DMA enable bit with the DMAC being active carries out the operations given
above, so the DMAC operates again from the initial state at the instant "1" is overwritten to the DMA
enable bit.
DMA request bit
The DMAC can generate a DMA transfer request signal triggered by a factor chosen in advance out of
DMA request factors for each channel.
DMA request factors include the following.
* Factors effected by using the interrupt request signals from the built-in peripheral functions and software
DMA factors (internal factors) effected by a program.
* External factors effected by utilizing the input from external interrupt signals.
For the selection of DMA request factors, see the descriptions of the DMAi factor selection register.
The DMA request bit turns to "1" if the DMA transfer request signal occurs regardless of the DMAC's state
(regardless of whether the DMA enable bit is set "1" or to "0"). It turns to "0" immediately before data
transfer starts.
In addition, it can be set to "0" by use of a program, but cannot be set to "1".
There can be instances in which a change in DMA request factor selection bit causes the DMA request bit
to turn to "1". So be sure to set the DMA request bit to "0" after the DMA request factor selection bit is
changed.
The DMA request bit turns to "1" if a DMA transfer request signal occurs, and turns to "0" immediately
before data transfer starts. If the DMAC is active, data transfer starts immediately, so the value of the
DMA request bit, if read by use of a program, turns out to be "0" in most cases. To examine whether the
DMAC is active, read the DMA enable bit.
Here follows the timing of changes in the DMA request bit.
(1) Internal factors
Except the DMA request factors triggered by software, the timing for the DMA request bit to turn to "1"
due to an internal factor is the same as the timing for the interrupt request bit of the interrupt control
register to turn to "1" due to several factors.
Turning the DMA request bit to "1" due to an internal factor is timed to be effected immediately before
the transfer starts.
(2) External factors
An external factor is a factor caused to occur by the leading edge of input from the INTi pin (i depends
on which DMAC channel is used).
Selecting the INTi pins as external factors using the DMA request factor selection bit causes input
from these pins to become the DMA transfer request signals.
The timing for the DMA request bit to turn to "1" when an external factor is selected synchronizes with
the signal's edge applicable to the function specified by the DMA request factor selection bit (synchro-
nizes with the trailing edge of the input signal to each INTi pin, for example).
With an external factor selected, the DMA request bit is timed to turn to "0" immediately before data
transfer starts similarly to the state in which an internal factor is selected.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M306N5MCV-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Renesas MCU |
| M306N5MCV-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Renesas MCU |
| M306N5MC-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Renesas MCU |
| M306NKFHGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Renesas MCU |
| M306NKFHGP#U3 | 功能描述:IC M16C MCU FLASH 384K 100LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:M16C™ M16C/60/6NK 標(biāo)準(zhǔn)包裝:1 系列:AVR® ATmega 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，SPI，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，POR，PWM，WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB（16K x 16） 程序存儲器類型:閃存 EEPROM 大小:1K x 8 RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:44-TQFP 包裝:剪切帶 (CT) 其它名稱:ATMEGA324P-B15AZCT |
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