C8051F124-GQR Datasheet, PDF (101/350 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
7.3.2. Window Detector In Differential Mode
Figure 7.6 shows two example window comparisons for differential mode, with ADC2LT = 0x10 (+16d) and
ADC2GT = 0xFF (-1d). Notice that in Differential mode, the codes vary from -VREF to VREF*(127/128)
and are represented as 8-bit 2’s complement signed integers. In the left example, an AD2WINT interrupt
will be generated if the ADC2 conversion word (ADC2L) is within the range defined by ADC2GT and
ADC2LT (if 0xFF (-1d) < ADC2 < 0x0F (16d)). In the right example, an AD2WINT interrupt will be gener-
ated if ADC2 is outside of the range defined by ADC2GT and ADC2LT (if ADC2 < 0xFF (-1d) or ADC2 >
0x10 (+16d)).
Input Voltage
(AIN2.x - AIN2.y)
REF x (127/128)
ADC2
0x7F (127d)
REF x (16/128)
REF x (-1/256)
0x11 (17d)
0x10 (16d)
0x0F (15d)
0x00 (0d)
0xFF (-1d)
0xFE (-2d)
AD2WINT
not affected
ADC2LT
AD2WINT=1
ADC2GT
Input Voltage
(AIN2.x - AIN2.y)
REF x (127/128)
ADC2
0x7F (127d)
REF x (16/128)
REF x (-1/256)
0x11 (17d)
0x10 (16d)
0x0F (15d)
0x00 (0d)
0xFF (-1d)
0xFE (-2d)
AD2WINT=1
ADC2GT
AD2WINT
not affected
ADC2LT
-REF
0x80 (-128d)
AD2WINT
not affected
-REF
0x80 (-128d)
AD2WINT=1
Figure 7.6. ADC2 Window Compare Examples, Differential Mode
Rev. 1.4
101