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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MCF5270CVM150R2
寤犲晢锛� Freescale Semiconductor
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 195/626闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC MCU 32BIT 150MHZ 196-MAPBGA
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 750
绯诲垪锛� MCF527x
鏍稿績铏曠悊鍣細 Coldfire V2
鑺珨灏哄锛� 32-浣�
閫熷害锛� 150MHz
閫i€氭€э細 EBI/EMI锛屼互澶恫(w菐ng)锛孖²C锛孲PI锛孶ART/USART
澶栧湇瑷�(sh猫)鍌欙細 DMA锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 97
绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 ROMless
RAM 瀹归噺锛� 64K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 1.4 V ~ 1.6 V
鎸暕鍣ㄥ瀷锛� 澶栭儴
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 196-LBGA
鍖呰锛� 甯跺嵎 (TR)
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DMA Controller Module
MCF5271 Reference Manual, Rev. 2
14-10
Freescale Semiconductor
14.3.5 DMA Control Registers (DCR0鈥揇CR3)
DCRn, shown in Figure 14-8, is used for configuring the DMA controller module.
1
BSY
Busy
0 DMA channel is inactive. Cleared when the DMA has finished the last transaction.
1 BSY is set the first time the channel is enabled after a transfer is initiated.
0
DONE
Transactions done. Set when all DMA controller transactions complete, as determined by
transfer count or error conditions. When BCR reaches zero, DONE is set when the final
transfer completes successfully. DONE can also be used to abort a transfer by resetting
the status bits. When a transfer completes, software must clear DONE before
reprogramming the DMA.
0 Writing or reading a 0 has no effect.
1 DMA transfer completed. Writing a 1 to this bit clears all DMA status bits and can be
used in an interrupt handler to clear the DMA interrupt and error bits.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R INT EEXT CS
AA
BWC
0
SINC
SSIZE
DINC
DSIZE
0
W
START
Reset
0
000000
0
000000
0
15
14
13
12
11
10
98
7
654321
0
R
SMOD
DMOD
D_REQ
0
LINKCC
LCH1
LCH2
W
Reset
0
000000
0
000000
0
Address
IPSBAR + 0x00_010C (DMA0); IPSBAR + 0x011C (DMA1);
IPSBAR + 0x012C (DMA2); IPSBAR + 0x013C (DMA3)
Figure 14-8. DMA Control Registers (DCRn)
Table 14-4. DCRn Field Descriptions
Bits
Name
Description
31
INT
Interrupt on completion of transfer. Determines whether an interrupt is generated by
completing a transfer or by the occurrence of an error condition.
0 No interrupt is generated.
1 Internal interrupt signal is enabled.
30
EEXT
Enable external request. Care should be taken because a collision can occur between the
START bit and DREQn when EEXT = 1.
0 External request is ignored.
1 Enables external request to initiate transfer. The internal request (initiated by setting the
START bit) is always enabled.
Table 14-3. DSRn Field Descriptions (Continued)
Bits
Name
Description
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