C8051F124 Silicon Laboratories Inc, C8051F124 Datasheet - Page 58

• Manufacturer Part Number: C8051F124
• Description: IC 8051 MCU 128K FLASH 100TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F12xr

Specifications of C8051F124

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 64
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b, 8x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
5.2.2. 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 5.3). 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
“5.2.3. Settling Time Requirements” on page 59
58
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 5.3. 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