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MMA6525KW Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc |
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MMA6525KW Datasheet(HTML) 41 Page - Freescale Semiconductor, Inc |
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41 / 56 page  Sensor Freescale Semiconductor, Inc. 41 MMA65xx 3.8.11 PCM Output Function The device provides the option for a PCM output function. The PCM output is enabled by setting the A_CFG bits in the DEVCFG register to the appropriate state as described in Section 3.1.6.6. Selecting the PCM output enables the following func- tions: • The PCM_X and PCM_Y pins are programmed as a digital outputs. Reference Section 2.3 for the pin electrical parameters. • The acceleration value output from the offset cancellation block is saturated to 9-bits and converted to an unsigned value. Note, the 9-bit unsigned acceleration value uses the full range of values (0 - 511). • The 9-bit acceleration value is input into a summer clocked at 8MHz. • The carry from the summer circuit is output to the PCM pin. A block diagram of the PCM output is shown in Figure 32. Exception conditions affect the PCM output as listed in Section 4.5. Figure 32. PCM Output Function Block Diagram Output Scaling OC_x[9:1] A 9 Bit ADDER ARM_x/PCM_x B CARRY SUM fCLK = 8 MHz Sample updated every 8 μS 9 9 9 D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q D FF CLK Q Q |
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