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C8051F50X Datasheet(PDF) 60 Page - Silicon Laboratories |
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C8051F50X Datasheet(HTML) 60 Page - Silicon Laboratories |
60 / 312 page C8051F50x-F51x 60 Rev. 1.1 6.3.2. Setting the Gain Value The three programmable gain registers are accessed indirectly using the ADC0H and ADC0L registers when the GAINEN bit (ADC0CF.0) bit is set. ADC0H acts as the address register, and ADC0L is the data register. The programmable gain registers can only be written to and cannot be read. See Gain Register Definition 6.1, Gain Register Definition 6.2, and Gain Register Definition 6.3 for more information. The gain is programmed using the following steps: 1. Set the GAINEN bit (ADC0CF.0) 2. Load the ADC0H with the ADC0GNH, ADC0GNL, or ADC0GNA address. 3. Load ADC0L with the desired value for the selected gain register. 4. Reset the GAINEN bit (ADC0CF.0) Notes: 1. An ADC conversion should not be performed while the GAINEN bit is set. 2. Even with gain enabled, the maximum input voltage must be less than VREGIN and the maximum voltage of the signal after gain must be less than or equal to VREF. In code, changing the value to 0.44 gain from the previous example looks like: // in ‘C’: ADC0CF |= 0x01; // GAINEN = 1 ADC0H = 0x04; // Load the ADC0GNH address ADC0L = 0x6C; // Load the upper byte of 0x6CA to ADC0GNH ADC0H = 0x07; // Load the ADC0GNL address ADC0L = 0xA0; // Load the lower nibble of 0x6CA to ADC0GNL ADC0H = 0x08; // Load the ADC0GNA address ADC0L = 0x01; // Set the GAINADD bit ADC0CF &= ~0x01; // GAINEN = 0 ; in assembly ORL ADC0CF,#01H ; GAINEN = 1 MOV ADC0H,#04H ; Load the ADC0GNH address MOV ADC0L,#06CH ; Load the upper byte of 0x6CA to ADC0GNH MOV ADC0H,#07H ; Load the ADC0GNL address MOV ADC0L,#0A0H ; Load the lower nibble of 0x6CA to ADC0GNL MOV ADC0H,#08H ; Load the ADC0GNA address MOV ADC0L,#01H ; Set the GAINADD bit ANL ADC0CF,#0FEH ; GAINEN = 0 |
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