C8051F221-GQR Silicon Laboratories Inc, C8051F221-GQR Datasheet - Page 46

• Manufacturer Part Number: C8051F221-GQR
• Description: IC 8051 MCU 8K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F2xxr

Specifications of C8051F221-GQR

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 22x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Processor Series: C8051F2x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3 bit
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F226DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 32 Channel
• For Use With: 336-1241 - DEV KIT F220/221/226/230/231/236
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

C8051F2xx
6.3.
The ADC programmable window detector is very useful in many applications. It continuously compares
the ADC output to user-programmed limits and notifies the system when an out-of-band condition is
detected. This is especially effective in an interrupt-driven system, saving code space and CPU bandwidth
while delivering faster system response times. The window detector interrupt flag (ADWINT in ADC0CN)
can also be used in polled mode. The high and low bytes of the reference words are loaded into the ADC
Greater-Than and ADC Less-Than registers (ADC0GTH, ADC0GTL, ADC0LTH, and ADC0LTL).
Figure 6.3 and Figure 6.4 show example comparisons for reference. Notice that the window detector flag
can be asserted when the measured data is inside or outside the user-programmed limits, depending on
the programming of the ADC0GTx and ADC0LTx registers.
46
Bits7–0:
The low byte of the ADC Greater-Than Data Word.
Definition: ADC Greater-Than Data Word = ADC0GTH:ADC0GTL
Bits7–0:
The high byte of the ADC Greater-Than Data Word.
Bits7–0:
The high byte of the ADC Less-Than Data Word.
SFR Definition 6.6. ADC0GTH: ADC Greater-Than Data High Byte (C8051F206)
SFR Definition 6.7. ADC0GTL: ADC Greater-Than Data Low Byte (C8051F206)
R/W
Bit7
SFR Definition 6.8. ADC0LTH: ADC Less-Than Data High Byte (C8051F206)
R/W
Bit7
R/W
Bit7
ADC Programmable Window Detector
R/W
Bit6
R/W
R/W
Bit6
Bit6
R/W
Bit5
R/W
Bit5
R/W
Bit5
R/W
Bit4
R/W
R/W
Bit4
Bit4
Rev. 1.6
R/W
Bit3
R/W
R/W
Bit3
Bit3
R/W
Bit2
R/W
R/W
Bit2
Bit2
R/W
Bit1
R/W
R/W
Bit1
Bit1
R/W
Bit0
R/W
R/W
Bit0
Bit0
SFR Address:
SFR Address:
SFR Address:
Reset Value
Reset Value
Reset Value
11111111
11111111
11111111
0xC4
0xC5
0xC4