C8051F300_08 Datasheet, PDF (46/179 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F300/1/2/3/4/5
5.4.2. Window Detector In Differential Mode
Figure 5.7 shows two example window comparisons for differential mode, with ADC0LT = 0x10 (+16d) and
ADC0GT = 0xFF (–1d). Notice that in Differential mode, the codes vary from –VREF to VREF x (127/128)
and are represented as 8-bit 2’s complement signed integers. In the left example, an AD0WINT interrupt
will be generated if the ADC0 conversion word (ADC0L) is within the range defined by ADC0GT and
ADC0LT (if 0xFF (–1d) < ADC0 < 0x10 (16d)). In the right example, an AD0WINT interrupt will be gener-
ated if ADC0 is outside of the range defined by ADC0GT and ADC0LT (if ADC0 < 0xFF (–1d) or ADC0 >
0x10 (+16d)).
Input Voltage
(P0.x - P0.y)
REF x (127/128)
ADC0
0x7F (127d)
REF x (16/128)
REF x (-1/256)
0x11 (17d)
0x10 (16d)
0x0F (15d)
0x00 (0d)
0xFF (-1d)
0xFE (-2d)
AD0WINT
not affected
ADC0LT
AD0WINT=1
ADC0GT
Input Voltage
(P0.x - P0.y)
REF x (127/128)
ADC0
0x7F (127d)
REF x (16/128)
REF x (-1/256)
0x11 (17d)
0x10 (16d)
0x0F (15d)
0x00 (0d)
0xFF (-1d)
0xFE (-2d)
AD0WINT=1
ADC0GT
AD0WINT
not affected
ADC0LT
-REF
0x80 (-128d)
AD0WINT
not affected
-REF
0x80 (-128d)
AD0WINT=1
Figure 5.7. ADC Window Compare Examples, Differential Mode
SFR Definition 5.5. ADC0GT: ADC0 Greater-Than Data Byte (C8051F300/2)
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: ADC0 Greater-Than Data Word.
SFR Definition 5.6. ADC0LT: ADC0 Less-Than Data Byte (C8051F300/2)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xC6
Bits7–0: ADC0 Less-Than Data Word.
46
Rev. 2.9