C8051F021 Silicon Laboratories Inc, C8051F021 Datasheet - Page 80

• Manufacturer Part Number: C8051F021
• Description: IC 8051 MCU 64K FLASH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F02xr

Specifications of C8051F021

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 4.25K 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: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F020/1/2/3
80
Bit7:
Bit6:
Bit5:
Bit4:
Bit3-1:
Bit0:
AD1EN
R/W
Bit7
AD1EN: ADC1 Enable Bit.
0: ADC1 Disabled. ADC1 is in low-power shutdown.
1: ADC1 Enabled. ADC1 is active and ready for data conversions.
AD1TM: ADC1 Track Mode Bit.
0: Normal Track Mode: When ADC1 is enabled, tracking is continuous unless a conversion is in pro-
cess.
1: Low-power Track Mode: Tracking Defined by AD1STM2-0 bits (see below).
AD1INT: ADC1 Conversion Complete Interrupt Flag.
This flag must be cleared by software.
0: ADC1 has not completed a data conversion since the last time this flag was cleared.
1: ADC1 has completed a data conversion.
AD1BUSY: ADC1 Busy Bit.
Read:
0: ADC1 Conversion is complete or a conversion is not currently in progress. AD1INT is set to logic
1 on the falling edge of AD1BUSY.
1: ADC1 Conversion is in progress.
Write:
0: No Effect.
1: Initiates ADC1 Conversion if AD1STM2-0 = 000b
AD1CM2-0: ADC1 Start of Conversion Mode Select.
AD1TM = 0:
000: ADC1 conversion initiated on every write of ‘1’ to AD1BUSY.
001: ADC1 conversion initiated on overflow of Timer 3.
010: ADC1 conversion initiated on rising edge of external CNVSTR.
011: ADC1 conversion initiated on overflow of Timer 2.
1xx: ADC1 conversion initiated on write of ‘1’ to AD0BUSY (synchronized with ADC0 software-
commanded conversions).
AD1TM = 1:
000: Tracking initiated on write of ‘1’ to AD1BUSY and lasts 3 SAR1 clocks, followed by conver-
sion.
001: Tracking initiated on overflow of Timer 3 and lasts 3 SAR1 clocks, followed by conversion.
010: ADC1 tracks only when CNVSTR input is logic low; conversion starts on rising CNVSTR edge.
011: Tracking initiated on overflow of Timer 2 and lasts 3 SAR1 clocks, followed by conversion.
1xx: Tracking initiated on write of ‘1’ to AD0BUSY and lasts 3 SAR1 clocks, followed by conver-
sion.
UNUSED. Read = 0b. Write = don’t care.
AD1TM
Figure 7.6. ADC1CN: ADC1 Control Register (C8051F020/1/2/3)
R/W
Bit6
AD1INT AD1BUSY AD1CM2 AD1CM1
R/W
Bit5
R/W
Bit4
Rev. 1.4
R/W
Bit3
R/W
Bit2
AD1CM0
R/W
Bit1
R/W
Bit0
-
SFR Address:
00000000
Reset Value
0xAA