MSP430F551X_1 Datasheet, PDF (27/115 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F551x
MSP430F552x
www.ti.com
SLAS590D – OCTOBER 2009 – REVISED APRIL 2010
DMA Controller
The DMA controller allows movement of data from one memory address to another without CPU intervention. For
example, the DMA controller can be used to move data from the ADC12_A conversion memory to RAM. Using
the DMA controller can increase the throughput of peripheral modules. The DMA controller reduces system
power consumption by allowing the CPU to remain in sleep mode, without having to awaken to move data to or
from a peripheral.
The USB timestamp generator also utilizes the DMA trigger assignments described in Table 12.
TRIGGER
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Table 12. DMA Trigger Assignments⁽¹⁾
0
DMAREQ
TA0CCR0 CCIFG
TA0CCR2 CCIFG
TA1CCR0 CCIFG
TA1CCR2 CCIFG
TA2CCR0 CCIFG
TA2CCR2 CCIFG
TB0CCR0 CCIFG
TB0CCR2 CCIFG
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
UCA0RXIFG
UCA0TXIFG
UCB0RXIFG
UCB0TXIFG
UCA1RXIFG
UCA1TXIFG
UCB1RXIFG
UCB1TXIFG
ADC12IFGx ⁽²⁾
Reserved
Reserved
USB FNRXD
USB ready
MPY ready
DMA2IFG
DMAE0
CHANNEL
1
DMAREQ
TA0CCR0 CCIFG
TA0CCR2 CCIFG
TA1CCR0 CCIFG
TA1CCR2 CCIFG
TA2CCR0 CCIFG
TA2CCR2 CCIFG
TB0CCR0 CCIFG
TB0CCR2 CCIFG
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
UCA0RXIFG
UCA0TXIFG
UCB0RXIFG
UCB0TXIFG
UCA1RXIFG
UCA1TXIFG
UCB1RXIFG
UCB1TXIFG
ADC12IFGx ⁽²⁾
Reserved
Reserved
USB FNRXD
USB ready
MPY ready
DMA0IFG
DMAE0
2
DMAREQ
TA0CCR0 CCIFG
TA0CCR2 CCIFG
TA1CCR0 CCIFG
TA1CCR2 CCIFG
TA2CCR0 CCIFG
TA2CCR2 CCIFG
TB0CCR0 CCIFG
TB0CCR2 CCIFG
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
UCA0RXIFG
UCA0TXIFG
UCB0RXIFG
UCB0TXIFG
UCA1RXIFG
UCA1TXIFG
UCB1RXIFG
UCB1TXIFG
ADC12IFGx ⁽²⁾
Reserved
Reserved
USB FNRXD
USB ready
MPY ready
DMA1IFG
DMAE0
(1) If a reserved trigger source is selected, no Trigger1 is generated.
(2) Only on devices with ADC. Reserved on devices without ADC.
Universal Serial Communication Interface (USCI)
The USCI modules are used for serial data communication. The USCI module supports synchronous
communication protocols such as SPI (3 or 4 pin) and I²C, and asynchronous communication protocols such as
UART, enhanced UART with automatic baudrate detection, and IrDA. Each USCI module contains two portions,
A and B.
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