C8051F2XX Datasheet, PDF (46/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
6.3. ADC Programmable Window Detector
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.
SFR Definition 6.6. ADC0GTH: ADC Greater-Than Data High Byte (C8051F206)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
11111111
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address:
0xC5
Bits7–0:
The high byte of the ADC Greater-Than Data Word.
SFR Definition 6.7. ADC0GTL: ADC Greater-Than Data Low Byte (C8051F206)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bits7–0:
The low byte of the ADC Greater-Than Data Word.
Definition: ADC Greater-Than Data Word = ADC0GTH:ADC0GTL
R/W
Reset Value
11111111
Bit0 SFR Address:
0xC4
SFR Definition 6.8. ADC0LTH: ADC Less-Than Data High Byte (C8051F206)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
11111111
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address:
0xC4
Bits7–0:
The high byte of the ADC Less-Than Data Word.
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Rev. 1.6