C8051F310 datasheet(61/224 Pages) ETC1

61 / 224 page

Rev. 1.6

C8051F310/1/2/3/4/5/6/7

5.4.1. Window Detector In Single-Ended Mode

Figure 5.6 shows two example window comparisons for right-justified, single-ended data, with

ADC0LTH:ADC0LTL = 0x0080 (128d) and ADC0GTH:ADC0GTL = 0x0040 (64d). In single-ended mode,

the input voltage can range from ‘0’ to VREF x (1023/1024) with respect to GND, and is represented by a

10-bit unsigned integer value. In the left example, an AD0WINT interrupt will be generated if the ADC0

conversion

word

(ADC0H:ADC0L)

within

the

range

defined

ADC0GTH:ADC0GTL

and

ADC0LTH:ADC0LTL (if 0x0040 < ADC0H:ADC0L < 0x0080). In the right example, and AD0WINT interrupt

will be generated if the ADC0 conversion word is outside of the range defined by the ADC0GT and

ADC0LT registers (if ADC0H:ADC0L < 0x0040 or ADC0H:ADC0L > 0x0080). Figure 5.7 shows an exam-

ple using left-justified data with the same comparison values.

Figure 5.6. ADC Window Compare Example: Right-Justified Single-Ended Data

Figure 5.7. ADC Window Compare Example: Left-Justified Single-Ended Data

0x03FF

0x0081

0x0080

0x007F

0x0041

0x0040

0x003F

0x0000

Input Voltage

(Px.x - GND)

VREF x (1023/1024)

VREF x (128/1024)

VREF x (64/1024)

AD0WINT=1

AD0WINT

not affected

AD0WINT

not affected

ADC0LTH:ADC0LTL

ADC0GTH:ADC0GTL

0x03FF

0x0081

0x0080

0x007F

0x0041

0x0040

0x003F

0x0000

Input Voltage

(Px.x - GND)

VREF x (1023/1024)

VREF x (128/1024)

VREF x (64/1024)

AD0WINT

not affected

AD0WINT=1

ADC0H:ADC0L

ADC0GTH:ADC0GTL

ADC0LTH:ADC0LTL

0xFFC0

0x2040

0x2000

0x1FC0

0x1040

0x1000

0x0FC0

0x0000

Input Voltage

(Px.x - GND)

VREF x (1023/1024)

VREF x (128/1024)

VREF x (64/1024)

AD0WINT=1

AD0WINT

not affected

AD0WINT

not affected

ADC0LTH:ADC0LTL

ADC0GTH:ADC0GTL

0xFFC0

0x2040

0x2000

0x1FC0

0x1040

0x1000

0x0FC0

0x0000

Input Voltage

(Px.x - GND)

VREF x (1023/1024)

VREF x (128/1024)

VREF x (64/1024)

AD0WINT

not affected

AD0WINT=1

ADC0H:ADC0L

ADC0LTH:ADC0LTL

ADC0GTH:ADC0GTL

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