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SH7018 Datasheet(PDF) 290 Page - Renesas Technology Corp |
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SH7018 Datasheet(HTML) 290 Page - Renesas Technology Corp |
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290 / 431 page  274 13.4.4 MTU Trigger Input Timing A/D conversion can also be started by MTU trigger input. When the TRGE bit is set to 1 in the A/D control register (ADCR), input from the MTU functions as trigger input. When an MTU trigger is detected, the ADST bit is set to 1 in the A/D control/status register (ADST), and the A/D converter is started. Other operations, for both single mode and scan mode, are the same as when the ADST bit is set to 1 by software, . Figure 13.6 shows the timing for MTU trigger input. A/D conversion CK MTU trigger signal ADST Figure 13.6 External Trigger Input Timing 13.5 A/D Conversion Precision Definitions The A/D converter converts analog values input from analog input channels to 10-bit digital values by comparing them with an analog reference voltage. In this operation, the absolute precision of the A/D conversion (i.e. the deviation between the input analog value and the output digital value) includes the following kinds of error. 1. Offset error 2. Full-scale error 3. Quantization error 4. Nonlinearity error |
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