C8051F980-C-GM Datasheet, PDF (82/325 Pages) Silicon Laboratories – Ultra Low Power, 8-2 kB Flash, Capacitive Sensing MCU

C8051F99x-C8051F98x
5.6.1. Window Detector In Single-Ended Mode
Figure 5.5 shows two example window comparisons for right-justified data, with
ADC0LTH:ADC0LTL = 0x0080 (128d) and ADC0GTH:ADC0GTL = 0x0040 (64d). 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) is within the range defined by 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 5.6 shows an example using left-
justified data with the same comparison values.
ADC0H:ADC0L
Input Voltage
(Px.x - GND)
VREF x (1023/1024) 0x03FF
VREF x (128/1024)
VREF x (64/1024)
0x0081
0x0080
0x007F
0x0041
0x0040
0x003F
ADC0H:ADC0L
Input Voltage
(Px.x - GND)
VREF x (1023/1024) 0x03FF
AD0WINT
not affected
ADC0LTH:ADC0LTL
AD0WINT=1
ADC0GTH:ADC0GTL
VREF x (128/1024)
VREF x (64/1024)
0x0081
0x0080
0x007F
0x0041
0x0040
0x003F
AD0WINT=1
ADC0GTH:ADC0GTL
AD0WINT
not affected
ADC0LTH:ADC0LTL
0
0x0000
AD0WINT
not affected
0
0x0000
AD0WINT=1
Figure 5.5. ADC Window Compare Example: Right-Justified Single-Ended Data
Input Voltage
(Px.x - GND)
ADC0H:ADC0L
VREF x (1023/1024) 0xFFC0
VREF x (128/1024)
VREF x (64/1024)
0x2040
0x2000
0x1FC0
0x1040
0x1000
0x0FC0
Input Voltage
(Px.x - GND)
ADC0H:ADC0L
VREF x (1023/1024) 0xFFC0
AD0WINT
not affected
ADC0LTH:ADC0LTL
AD0WINT=1
ADC0GTH:ADC0GTL
VREF x (128/1024)
VREF x (64/1024)
0x2040
0x2000
0x1FC0
0x1040
0x1000
0x0FC0
AD0WINT=1
ADC0GTH:ADC0GTL
AD0WINT
not affected
ADC0LTH:ADC0LTL
0
0x0000
AD0WINT
not affected
0
0x0000
AD0WINT=1
Figure 5.6. ADC Window Compare Example: Left-Justified Single-Ended Data
5.6.2. ADC0 Specifications
See “4. Electrical Characteristics” on page 48 for a detailed listing of ADC0 specifications.
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Rev. 1.2