C8051F131R Silicon Labs, C8051F131R Datasheet - Page 76
C8051F131R
Manufacturer Part Number
C8051F131R
Description
8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
Manufacturer
Silicon Labs
Datasheet
1.C8051F133R.pdf
(350 pages)
Specifications of C8051F131R
Product Category
8-bit Microcontrollers - MCU
Core
8051
Data Bus Width
8 bit
Maximum Clock Frequency
100 MHz
Program Memory Size
128 KB
Data Ram Size
8.25 KB
On-chip Adc
Yes
Operating Supply Voltage
2.7 V to 3.6 V
Package / Case
TQFP-64
Mounting Style
SMD/SMT
A/d Bit Size
10 bit
A/d Channels Available
9
Data Rom Size
64 KB
Interface Type
I2C, SMBus, SPI, UART
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
32
Number Of Timers
16 bit
Processor Series
C8051
Program Memory Type
Flash
Factory Pack Quantity
500
Supply Voltage - Max
3.6 V
Supply Voltage - Min
3 V
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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
6.2.2. Tracking Modes
The AD0TM bit in register ADC0CN controls the ADC0 track-and-hold mode. In its default state, the ADC0
input is continuously tracked when a conversion is not in progress. When the AD0TM bit is logic 1, ADC0
operates in low-power track-and-hold mode. In this mode, each conversion is preceded by a tracking
period of 3 SAR clocks (after the start-of-conversion signal). When the CNVSTR0 signal is used to initiate
conversions in low-power tracking mode, ADC0 tracks only when CNVSTR0 is low; conversion begins on
the rising edge of CNVSTR0 (see Figure 6.3). Tracking can also be disabled (shutdown) when the entire
chip is in low power standby or sleep modes. Low-power track-and-hold mode is also useful when AMUX
or PGA settings are frequently changed, to ensure that settling time requirements are met (see
“6.2.3. Settling Time Requirements” on page 77
76
Timer 2, Timer 3 Overflow;
(AD0CM[1:0]=00, 01, 11)
Write '1' to AD0BUSY
(AD0CM[1:0]=10)
SAR Clocks
SAR Clocks
SAR Clocks
ADC0TM=1
ADC0TM=0
ADC0TM=1
ADC0TM=0
CNVSTR0
Figure 6.3. ADC0 Track and Conversion Example Timing
A. ADC Timing for External Trigger Source
B. ADC Timing for Internal Trigger Sources
Low Power
Low Power
or Convert
or Convert
Track or
Convert
Track Or Convert
1
1
Track
2
2
Track
3
3
4
4
1
5
5
2
6
6
3
7
7
Rev. 1.4
Convert
).
4
8
8
5
9
9
10 11 12 13 14 15 16 17 18 19
10 11 12 13 14 15 16
6
Convert
7
Convert
Convert
8
9
10 11 12 13 14 15 16
Low Power Mode
Track
Low Power Mode
Track
Section
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