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C8051F50X Datasheet(PDF) 55 Page - Silicon Laboratories |
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C8051F50X Datasheet(HTML) 55 Page - Silicon Laboratories |
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55 / 312 page  Rev. 1.1 55 C8051F50x-F51x Figure 6.3. 12-Bit ADC Tracking Mode Example 6.1.4. Burst Mode Burst Mode is a power saving feature that allows ADC0 to remain in a very low power state between con- versions. When Burst Mode is enabled, ADC0 wakes from a very low power state, accumulates 1, 4, 8, or 16 samples using an internal Burst Mode clock (approximately 25 MHz), then re-enters a very low power state. Since the Burst Mode clock is independent of the system clock, ADC0 can perform multiple conver- sions then enter a very low power state within a single system clock cycle, even if the system clock is slow (e.g., 32.768 kHz), or suspended. Burst Mode is enabled by setting BURSTEN to logic 1. When in Burst Mode, AD0EN controls the ADC0 idle power state (i.e. the state ADC0 enters when not tracking or performing conversions). If AD0EN is set to logic 0, ADC0 is powered down after each burst. If AD0EN is set to logic 1, ADC0 remains enabled after each burst. On each convert start signal, ADC0 is awakened from its Idle Power State. If ADC0 is powered down, it will automatically power up and wait the programmable Power-Up Time controlled by the AD0PWR bits. Otherwise, ADC0 will start tracking and converting immediately. Figure 6.4 shows an exam- ple of Burst Mode Operation with a slow system clock and a repeat count of 4. Important Note: When Burst Mode is enabled, only Post-Tracking and Dual-Tracking modes can be used. When Burst Mode is enabled, a single convert start will initiate a number of conversions equal to the repeat count. When Burst Mode is disabled, a convert start is required to initiate each conversion. In both modes, the ADC0 End of Conversion Interrupt Flag (AD0INT) will be set after “repeat count” conversions have Convert Start ADC0 State Track ADC0 State Convert Time F S1 S2 S12 S13 ... F Time F S1 S2 S12 S13 ... F Convert F S1 S2 F Post-Tracking or Dual-Tracking Modes (AD0TK = ‘00') Pre-Tracking Mode AD0INT Flag AD0INT Flag Key F Sn Equal to one period of FCLK. Each Sn is equal to one period of the SAR clock. |
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