C8051T603-GS(2007) 查看數據表（PDF） - Silicon Laboratories

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C8051T603-GS
(Rev.:2007)

Mixed Signal OTP EPROM MCU Family

Silicon Laboratories 

C8051T600/1/2/3/4/5

5.7. 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 (ADC0GTH, ADC0GTL) and Less-Than (ADC0LTH, ADC0LTL) registers hold the

comparison values. Example comparisons are shown in Figure 5.6. Notice that the window detector flag

can be programmed to indicate when measured data is inside or outside of the user-programmed limits

depending on the contents of the ADC0LTH:L and ADC0GTH:L registers.

5.7.1. Window Detector Example

Figure 5.6 shows two example window comparisons, using the ADC in 10-bit 1x gain mode. The ADC out-

put codes represent input voltages (AIN – GND) from 0 V to VREF x (1023/1024) and are represented as

10-bit unsigned integers. Note that the hexadecimal numbers shown are left-justified, 10-bit values. In the

example on the left-hand side, an AD0WINT interrupt will be generated if the ADC0 conversion word

(ADC0H:L) is within the range defined by ADC0GTH:L and ADC0LTH:L (if 0x1000 < ADC0H:L < 0x2000).

In the example on the right-hand side, an AD0WINT interrupt will be generated if ADC0 is outside of the

range defined by ADC0GTH:L and ADC0LTH:L (if ADC0H:L < 0x1000 or ADC0H:L > 0x2000).

Input Voltage

(AIN+ - GND)

REF x (1023/1204)

ADC0H:L

0xFFC0

REF x (1/8)

REF x (1/16)

0x2040

0x2000

0x1FC0

0x1040

0x1000

0x0FC0

AD0WINT

not affected

Input Voltage

(AIN+ - GND)

REF x (1023/1024)

ADC0H:L

0xFFC0

ADC0LTH:L

AD0WINT=1

ADC0GTH:L

REF x (1/8)

REF x (1/16)

0x2040

0x2000

0x1FC0

0x1040

0x1000

0x0FC0

0

0x0000

AD0WINT

not affected

0

0x0000

Figure 5.6. ADC Window Compare Examples

AD0WINT=1

ADC0GTH:L

AD0WINT

not affected

ADC0LTH:L

AD0WINT=1

42

Rev. 0.5

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