參數(shù)資料
型號: MB90487PF
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 87/113頁
文件大?。?/td> 1195K
代理商: MB90487PF
MB90480/485 Series
75
22.
DMAC
The
DMAC is a simplified DMA module with functions equivalent to EI2OS. The DMA has 16 DMA data transfer
channels, and provides the following functions.
Automatic data transfer between peripheral resources (I/O) and memory.
CPU program execution stops during DMA operation.
Incremental addressing for transfer source and destination can be turned on and off.
DMA transfer control from the DMA enable register, DMA stop status register, DMA status register, and
descriptor.
Stop requests from resources can stop DMA transfer.
When DMA transfer is completed, the DMA status register sets a flag in the bit for the corresponding channel
on which transfer was completed, and outputs a completion interrupt to the interrupt controller.
(1) Register List
DMA enable register
bit
Initial value
DERH : 0000ADH
00000000B
DMA enable register
bit
Initial value
DERL : 0000ACH
00000000B
DMA stop status register
bit
Initial value
DSSR : 0000A4H
00000000B
DMA status register
bit
Initial value
DSRH : 00009DH
00000000B
DMA status register
bit
Initial value
DSRL : 00009CH
00000000B
R/W
15
14
13
12
11
10
9
8
EN14
EN15
EN13
EN12
EN11
EN10
EN9
EN8
R/W
76
5
4
3
2
1
0
EN6
EN7
EN5
EN4
EN3
EN2
EN1
EN0
R/W
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
76
5
4
3
2
1
0
DE6
DE7
DE5
DE4
DE3
DE2
DE1
DE0
R/W
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