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C8051F300 Datasheet(PDF) 43 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 43 Page - List of Unclassifed Manufacturers |
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43 / 174 page  C8051F300/1/2/3/4/5 Rev. 2.6 43 5.4. Programmable Window Detector The ADC Programmable Window Detector continuously compares the ADC0 output to user-programmed limits, and notifies the system when a desired condition is detected. This is especially effective in an inter- rupt-driven system, saving code space and CPU bandwidth while delivering faster system response times. The window detector interrupt flag (AD0WINT in register ADC0CN) can also be used in polled mode. The ADC0 Greater-Than (ADC0GT) and Less-Than (ADC0LT) registers hold the comparison values. Example comparisons for Single-ended and Differential modes are shown in Figure 5.6 and Figure 5.7, respectively. Notice that the window detector flag can be programmed to indicate when measured data is inside or out- side of the user-programmed limits depending on the contents of the ADC0LT and ADC0GT registers. 5.4.1. Window Detector In Single-Ended Mode Figure 5.6 shows two example window comparisons for Single-ended mode, with ADC0LT = 0x20 and ADC0GT = 0x10. Notice that in Single-ended mode, the codes vary from 0 to VREF x (255/256) and are represented as 8-bit unsigned integers. In the left example, an AD0WINT interrupt will be generated if the ADC0 conversion word (ADC0) is within the range defined by ADC0GT and ADC0LT (if 0x10 < ADC0 < 0x20). In the right example, and AD0WINT interrupt will be generated if ADC0 is outside of the range defined by ADC0GT and ADC0LT (if ADC0 < 0x10 or ADC0 > 0x20). Figure 5.6. ADC Window Compare Examples, Single-Ended Mode 0xFF 0x21 0x20 0x1F 0x11 0x10 0x0F 0x00 0 Input Voltage (P0.x - GND) REF x (255/256) REF x (32/256) REF x (16/256) AD0WINT=1 AD0WINT not affected AD0WINT not affected ADC0LT ADC0GT 0xFF 0x21 0x20 0x1F 0x11 0x10 0x0F 0x00 0 Input Voltage (P0.x - GND) REF x (255/256) REF x (32/256) REF x (16/256) AD0WINT not affected ADC0GT ADC0LT AD0WINT=1 AD0WINT=1 ADC0 ADC0 |
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