參數(shù)資料
型號(hào): MB90F474LPF
元件分類(lèi): 微控制器/微處理器
英文描述: 16-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁(yè)數(shù): 94/118頁(yè)
文件大?。?/td> 1199K
代理商: MB90F474LPF
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MB90470 Series
77
21.
DMA
DMA is the simplified DMA which has the equivalent function to EI2OS function DMA has DMA transfer channel
which consists of 16 channels and has the following functions.
Automatic data transfer between peripheral resources (I/O) and memory.
CPU program executing stops dring DMA operation.
Selectable for address transfer increase/decrease .
DMA transfer control is done at DMA enable register, DMA stop status register, DMA status register and
descriptor.
Stop request stops DMA transfer from resources.
After DMA transfer, flag is set to bit corresponding to DMA status register transfer stop channel and stop
interrupt is output to interrupt controller.
(1) Register List
DMA enable register
DMA stop status register
DMA status register
bit
Initial value
DERH : 0000ADH
0 0 0 0 0 0 0 0B
bit
Initial value
DERL : 0000ACH
0 0 0 0 0 0 0 0B
bit
Initial value
DSSR : 0000A4H
0 0 0 0 0 0 0 0B
bit
Initial value
DSRH : 00009DH
0 0 0 0 0 0 0 0B
bit
Initial value
DSRL : 00009CH
0 0 0 0 0 0 0 0B
(R/W)
15
14
13
12
11
10
9
8
EN14
(R/W)
EN15
EN13
EN12
EN11
EN10
EN9
EN8
(R/W)
76
5
4
3
2
1
0
EN6
(R/W)
EN7
EN5
EN4
EN3
EN2
EN1
EN0
76
5
4
3
2
1
0
STP6
STP7
STP5
STP4
STP3
STP2
STP1
STP0
(R/W)
15
14
13
12
11
10
9
8
DE14
DE15
DE13
DE12
DE11
DE10
DE9
DE8
(R/W)
( R/W )
(R/W)
76
5
4
3
2
1
0
DE6
( R/W )
DE7
DE5
DE4
DE3
DE2
DE1
DE0
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