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8.4.1. Window Detector Example
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 8.5 shows an example using left-justi-
fied data with the same comparison values.
Input Voltage
(AIN - GND)
ADC0H:ADC0L
Input Voltage
(AIN - GND)
ADC0H:ADC0L
VREF x (1023/
0x03FF
VREF x (1023/
0x03FF
1024)
0x0081
AD0WINT
not affected
1024)
0x0081
AD0WINT=1
VREF x (128/1024)
VREF x (64/1024)
0x0080
0x007F
0x0041
0x0040
ADC0LTH:ADC0LTL
AD0WINT=1
ADC0GTH:ADC0GTL
VREF x (128/1024)
VREF x (64/1024)
0x0080
0x007F
0x0041
0x0040
ADC0GTH:ADC0GTL
AD0WINT
not affected
ADC0LTH:ADC0LTL
0x003F
AD0WINT
not affected
0x003F
AD0WINT=1
0
0x0000
0
0x0000
Figure 8.4. ADC Window Compare Example: Right-Justified Data
Input Voltage
(AIN - GND)
ADC0H:ADC0L
Input Voltage
(AIN - GND)
ADC0H:ADC0L
VREF x (1023/
0xFFC0
VREF x (1023/
0xFFC0
1024)
0x2040
AD0WINT
not affected
1024)
0x2040
AD0WINT=1
VREF x (128/1024)
VREF x (64/1024)
0x2000
0x1FC0
0x1040
0x1000
ADC0LTH:ADC0LTL
AD0WINT=1
ADC0GTH:ADC0GTL
VREF x (128/1024)
VREF x (64/1024)
0x2000
0x1FC0
0x1040
0x1000
ADC0GTH:ADC0GTL
AD0WINT
not affected
ADC0LTH:ADC0LTL
0x0FC0
AD0WINT
not affected
0x0FC0
AD0WINT=1
0
0x0000
0
0x0000
Figure 8.5. ADC Window Compare Example: Left-Justified Data
48
Rev 1.1
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相关PDF资料
C8051T630DB20
BOARD SOCKET DAUGHTER 20-QFN
CAN-100
BOARD EVAL RS232 100QFP
CANADAPT28
KIT ADAPTER CANDEMOBOARD 28PLCC
CAT24AA01WI-GT3
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