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ATmega16HVB 数据表(PDF) 126 Page - ATMEL Corporation |
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ATmega16HVB 数据表(HTML) 126 Page - ATMEL Corporation |
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126 / 273 page  126 8042A–AVR–07/09 ATmega16HVB/32HVB 21.6 Register Description 21.6.1 BGCCR - Bandgap Calibration C Register • Bits 7:6 - Res: Reserved Bits These bits are reserved bits and will always read as zero. • Bit 5:0 - BGCC5:0: BG Calibration of PTAT Current These bits are used for trimming of the nominal value of the bandgap reference voltage. These bits are binary coded. Minimum VREF: 000000, maximum VREF: 111111. Step size is approxi- mately 2 mV. 21.6.2 BGCRR - Bandgap Calibration R Register • Bit 7:0 - BGCR7:0: BG Calibration of Resistor ladder These bits are used for temperature gradient adjustment of the bandgap reference. Figure 21-2 illustrates VREF as a function of temperature. VREF has a positive temperature coefficient at low temperatures and negative temperature coefficient at high temperatures. Depending on the process variations, the top of the VREF curve may be located at higher or lower temperatures. To minimize the temperature drift in the temperature range of interest, BGCRR is used to adjust the top of the curve towards the centre of the temperature range of interest. The BGCRR bits are thermometer coded, resulting in 9 possible settings: 00000000, 00000001, 00000011, 00000111, … , 11111111. The value 00000000 shifts the top of the VREF curve to the highest possible temperature, and the value 11111111 shifts the top of the VREF curve to the lowest possible temperature. Bit 7 6 5 4 3 2 1 0 (0xD0) - - BGCC5 BGCC4 BGCC3 BGCC2 BGCC1 BGCC0 BGCCR Read/Write R R R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 5 4 3 2 1 0 (0xD1) BGCR7 BGCR6 BGCR5 BGCR4 BGCR3 BGCR2 BGCR1 BGCR0 BGCRR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 1 1 1 1 |
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