C8051F045 查看數據表（PDF） - Silicon Laboratories

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C8051F045

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

7.3. ADC2 Programmable Window Detector

The ADC2 Programmable Window Detector continuously compares the ADC2 output to user-programmed

limits, and notifies the system when an out-of-bound condition is detected. This is especially effective in an

interrupt-driven system, saving code space and CPU bandwidth while delivering faster system response

times. The window detector interrupt flag (AD2WINT in ADC2CN) can also be used in polled mode. The

reference words are loaded into the ADC2 Greater-Than and ADC2 Less-Than registers (ADC2GT and

ADC2LT). Notice that the window detector flag can be asserted when the measured data is inside or out-

side the user-programmed limits, depending on the programming of the ADC2GT and ADC2LT registers.

SFR Definition 7.6. ADC2GT: ADC2 Greater-Than Data

R/W

R/W

R/W

R/W

R/W

R/W

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bits7-0: High byte of ADC2 Greater-Than Data Word.

R/W

R/W

Reset Value

11111111

Bit1

Bit0

SFR Address: 0xC4

SFR Page: 2

SFR Definition 7.7. ADC2LT: ADC2 Less-Than Data

R/W

R/W

R/W

R/W

R/W

R/W

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bits7-0: Low byte of ADC2 Greater-Than Data Word.

R/W

R/W

Reset Value

00000000

Bit1

Bit0

SFR Address: 0xC6

SFR Page: 2

7.3.1. Window Detector in Single-Ended Mode

Figure 7.5 shows two example window comparisons for Single-ended mode, with ADC2LT = 0x20 and

ADC2GT = 0x10. 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 AD2WINT interrupt will be generated if the ADC2 con-

version word (ADC2) is within the range defined by ADC2GT and ADC2LT (if 0x10  ADC2  0x20). In the

right example, and AD2WINT interrupt will be generated if ADC2 is outside of the range defined by

ADC2GT and ADC2LT (if ADC2  0x10 or ADC2  0x20).

100

Rev. 1.5

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