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MAC7200 Datasheet(PDF) 814 Page - Freescale Semiconductor, Inc |
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MAC7200 Datasheet(HTML) 814 Page - Freescale Semiconductor, Inc |
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814 / 976 page ![]() Initialization/Application Information MAC7200 Microcontroller Family Reference Manual, Rev. 2 736 Freescale Semiconductor Figure 32-58. Time base period when running with a pre scaler ratio greater than 1 32.14.2.2 Coherent Accesses For IPWM, IPM and PEA modes, it is highly recommended that the software waits for a new FLAG set event before start reading UCAn and UCBn registers to get a new measurement. The FLAG indicates that new data has been captured and it is the only way to assure data coherency. The FLAG set event can be detected by polling the FLAG bit or by enabling the interrupt or DMA request generation. Reading the UCAn register again in the same period of the last read of UCBn register may lead to incoherent results. This will occur if the last read of UCBn register occurred after a disabled B2 to B1 transfer. clock pre scaled clock internal counter match value = 3 0 1 3 0 2 0 3 0 PRE SCALED CLOCK RATIO = 3 see note 1 Note 1: When a match occurs, the first clock cycle is used to clear the internal counter, and only after a second edge of pre scaled clock 1 2 the counter will start counting. |
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