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MCP2221 数据表(PDF) 9 Page - Microchip Technology |
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MCP2221 数据表(HTML) 9 Page - Microchip Technology |
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9 / 80 page  2015 Microchip Technology Inc. DS20005292B-page 9 MCP2221 REGISTER 1-4: CHIPSETTING3 REGISTER R/W-0 R/W-1 R/W-1 R/W-0 R/W-1 R/W-1 R/W-0 R/W-0 — INTDETFEEN INTDETREEN ADCVRM1 ADCVRM0 ADCREF — — bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7 Reserved: Set to ‘0’ bit 6 INTDETFEEN: Interrupt Falling Edge Detect Enable 1 = Interrupt detector will trigger when a falling edge is detected (factory default) 0 = Falling edges will not trigger the detector bit 5 INTDETREEN: Interrupt Rising Edge Detect Enable 1 = Interrupt detector will trigger when a rising edge is detected (factory default) 0 = Rising edges will not trigger the detector bit 4-3 ADCVRM<1:0>: ADC Internal Voltage Reference (ADC VRM) Selection 11 = VRM voltage is 4.096V (only if VDD is above this voltage) 10 = VRM voltage is 2.048V 01 = VRM voltage is 1.024V (factory default) 00 = VRM is off bit 2 ADCREF: ADC Reference Output Selection 1 = ADC reference output is ADC VRM voltage selection (factory default) 0 = ADC reference output is VDD bit 1-0 Reserved: Set to ‘0’ REGISTER 1-5: USBVIDL REGISTER R/W-1 R/W-1 R/W-0 R/W-1 R/W-1 R/W-0 R/W-0 R/W-0 USBVIDL7 USBVIDL6 USBVIDL5 USBVIDL4 USBVIDL3 USBVIDL2 USBVIDL1 USBVIDL0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 USBVIDL<7:0>: USB VID Lower Byte (factory default: 0xD8(hex)) REGISTER 1-6: USBVIDH REGISTER R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-1 R/W-0 R/W-0 USBVIDH7 USBVIDH6 USBVIDH5 USBVIDH4 USBVIDH3 USBVIDH2 USBVIDH1 USBVIDH0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 USBVIDH<7:0>: USB VID Higher Byte (factory default: 0x04(hex)) |
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