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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
17-15
6
UCPREN
Prescaler enable. Enables the prescaler counter.
0 Prescaler disabled (no clock) and prescaler counter is loaded with UCPREvalue
1 Prescaler enabled
7
DMA
Direct memory access. Selects if the FLAG generation will be used as an interrupt or as a
DMA request.
0 FLAG assigned to Interrupt request
1 FLAG assigned to DMA request
Not all eMIOS channels support DMA, as shown below. The DMA bit should not be
changed from its default value of 0 for any channel that does not support DMA. eMIOS
channels 6, 7, 10, 11, 16, 17, 18, and 19 DMA support is only for MPC5554.
Table 17-10. EMIOS_CCRn Field Description (Continued)
Bits
Name
Description
eMIOS Channel
DMA = 0
DMA = 1
0
Interrupt
DMA request
1
Interrupt
DMA request
2
Interrupt
DMA request
3
Interrupt
DMA request
4
Interrupt
DMA request
5
Interrupt
Reserved
6
Interrupt
DMA request
7
Interrupt
DMA request
8
Interrupt
DMA request
9
Interrupt
DMA request
10
Interrupt
DMA request
11
Interrupt
DMA request
12
Interrupt
Reserved
13
Interrupt
Reserved
14
Interrupt
Reserved
15
Interrupt
Reserved
16
Interrupt
DMA request
17
Interrupt
DMA request
18
Interrupt
DMA request
19
Interrupt
DMA request
20
Interrupt
Reserved
21
Interrupt
Reserved
22
Interrupt
Reserved
23
Interrupt
Reserved
Содержание MPC5553
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