C8051F960-A-GQ Silicon Labs, C8051F960-A-GQ Datasheet - Page 82
![no-image](/images/no-image-200.jpg)
C8051F960-A-GQ
Manufacturer Part Number
C8051F960-A-GQ
Description
8-bit Microcontrollers - MCU 128KB DC-DC LCD AES
Manufacturer
Silicon Labs
Datasheet
1.C8051F960-A-GQ.pdf
(492 pages)
Specifications of C8051F960-A-GQ
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
Maximum Clock Frequency
24.5 MHz
Program Memory Size
128 KB
Data Ram Size
8 KB
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 3.8 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
QFP-80
Mounting Style
SMD/SMT
Available stocks
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Part Number:
C8051F960-A-GQ
Manufacturer:
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Quantity:
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C8051F96x
5.2.3. Burst Mode
Burst Mode is a power saving feature that allows ADC0 to remain in a low power state between conver-
sions. When Burst Mode is enabled, ADC0 wakes from a low power state, accumulates 1, 4, 8, 16, 32, or
64 using an internal Burst Mode clock (approximately 20 MHz), then re-enters a low power state. Since the
Burst Mode clock is independent of the system clock, ADC0 can perform multiple conversions then enter a
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 5.3 shows an exam-
ple of Burst Mode Operation with a slow system clock and a repeat count of 4.
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
been accumulated. Similarly, the Window Comparator will not compare the result to the greater-than and
less-than registers until “repeat count” conversions have been accumulated.
In Burst Mode, tracking is determined by the settings in AD0PWR and AD0TK. The default settings for
these registers will work in most applications without modification; however, settling time requirements may
need adjustment in some applications. Refer to “5.2.4. Settling Time Requirements” on page 83 for more
details.
Notes:
82
Setting AD0TM to 1 will insert an additional 3 SAR clocks of tracking before each conversion,
regardless of the settings of AD0PWR and AD0TK.
When using Burst Mode, care must be taken to issue a convert start signal no faster than once every
four SYSCLK periods. This includes external convert start signals.
Figure 5.3. Burst Mode Tracking Example with Repeat Count Set to 4
System Clock
Convert Start
AD0TM = 1
AD0EN = 0
AD0TM = 0
AD0EN = 0
T = Tracking set by AD0TK
T3 = Tracking set by AD0TM (3 SAR clocks)
C = Converting
Powered
Powered
Down
Down
Power-Up
and Track
Power-Up
and Track
AD0PWR
T
3
C
C
T C T C T C
T
Rev. 0.5
T
3
C T
AD0TK
T
3
C T
T
3
Powered
C
Down
Powered
Down
Power-Up
and Track
Power-Up
and Track
T C..
T C..
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