Reaction Module (REACM)MPC5644A Microcontroller Reference Manual, Rev. 6Freescale Semiconductor 735Figure 23-34. DMA Req/Done protocol23.8 Reset overviewThe Reaction Module is reset whenever any MCU reset occurs. In order to re-initialize the reactionchannels the CHEN, channel enable register should be used. Once disabled the channel output is set toDOFF state and the channel configuration can be changed safely. The disable/enable operation does notchange the channel setup, thus the configuration registers remain at the state as before the channel wasdisabled. The Modulation Control word addressed by the channel after the enable bit is asserted is definedby the MODULATION ADDR field in the channel configuration register.23.9 Reaction module interruptsThe Reaction Module issues one global interrupt signal and one interrupt signal per channel. If using theGlobal interrupt signal the resolution of the interrupt source need to be performed by reading the GlobalError Flag register to evaluate which channel issued the interrupt. After that the Channel Status registerneed to be read to distinguish between the several interrupt sources by evaluating the flags MAXL, OCDF,SCDF, TAER, and SQER.Da b c ed ftimercontrolsignalCurrent inInjectortimetimeOFFONOFFA B C Emodulation word 0modulation word 1modulation word 2modulation word 3modulation word 4DMA DONEsignaltimeDMA REQsignaltime
