ZHCU032K December 2004 – August 2022 MSP430AFE221 , MSP430AFE222 , MSP430AFE223 , MSP430AFE231 , MSP430AFE232 , MSP430AFE233 , MSP430AFE251 , MSP430AFE252 , MSP430AFE253 , MSP430F2001 , MSP430F2002 , MSP430F2003 , MSP430F2011 , MSP430F2012 , MSP430F2013 , MSP430F2101 , MSP430F2111 , MSP430F2112 , MSP430F2121 , MSP430F2122 , MSP430F2131 , MSP430F2132 , MSP430F2132-EP , MSP430F2232 , MSP430F2234 , MSP430F2252 , MSP430F2252-Q1 , MSP430F2254 , MSP430F2272 , MSP430F2272-Q1 , MSP430F2274 , MSP430F2274-EP , MSP430F233 , MSP430F2330 , MSP430F235 , MSP430F2350 , MSP430F2370 , MSP430F2410 , MSP430F2416 , MSP430F2417 , MSP430F2418 , MSP430F2419 , MSP430F247 , MSP430F2471 , MSP430F248 , MSP430F2481 , MSP430F249 , MSP430F2491 , MSP430F2616 , MSP430F2617 , MSP430F2618 , MSP430F2619 , MSP430G2001 , MSP430G2101 , MSP430G2102 , MSP430G2111 , MSP430G2112 , MSP430G2121 , MSP430G2131 , MSP430G2132 , MSP430G2152 , MSP430G2153 , MSP430G2201 , MSP430G2201-Q1 , MSP430G2202 , MSP430G2203 , MSP430G2210 , MSP430G2211 , MSP430G2212 , MSP430G2213 , MSP430G2221 , MSP430G2230 , MSP430G2231 , MSP430G2231-Q1 , MSP430G2232 , MSP430G2233 , MSP430G2252 , MSP430G2253 , MSP430G2302 , MSP430G2303 , MSP430G2312 , MSP430G2313 , MSP430G2332 , MSP430G2333 , MSP430G2352 , MSP430G2353 , MSP430G2402 , MSP430G2403 , MSP430G2412 , MSP430G2413 , MSP430G2432 , MSP430G2433 , MSP430G2444 , MSP430G2452 , MSP430G2453 , MSP430G2513 , MSP430G2533 , MSP430G2544 , MSP430G2553 , MSP430G2744 , MSP430G2755 , MSP430G2855 , MSP430G2955 , MSP430TCH5E
在单次传输模式中,每字节/字的传输都需要一个单独的触发。在图 6-3中给出了单次传输状态图。
DMAxSZ 寄存器用来定义每次传输的数目。DMADSTINCRx 和 DMASRCINCRx 位用来选择在每次传输结束后目标地址和源地址是否增加或减少。如果 DMAxSZ=0,则没有传输发生。
DMAxSA,DMAxDA,和 DMAxSZ 寄存器都会被复制到临时寄存器中。在每次传输结束后,DMAxSA 和 DMAxDA 的临时值都会增加或者减少。在每次传输结束后 DMAxSZ 寄存器中的值会减少。当 DMAxSZ 寄存器的值减少至 0 时,将会从其临时寄存器中重载并且相应的 DMAIFG 标志将会置位。当 DMADTx=0 时,DMAEN 位将会被自动清零,当 DMAxSZ 减至 0 时必须为下一次传输的产生重新设置。
在重复的单次传输模式中,DMAEN=1 时 DMA 控制器保持被启用,每当一个触发后就会发生一个传输。