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MCP2221 数据表(PDF) 19 Page - Microchip Technology |
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MCP2221 数据表(HTML) 19 Page - Microchip Technology |
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19 / 80 page  2015 Microchip Technology Inc. DS20005292B-page 19 MCP2221 1.7.1.4 LED_URX The “RX” in this pin name refers to the UART of the MCP2221. The LED_URX pin is an indicator of UART RX characters being received. This pin will pulse low or high (depending on the chip configuration settings; see the CHIPSETTING0 register for more details) for a period of time (a few milliseconds). This allows the application to provide a visual indication of the UART RX traffic. 1.7.1.5 LED_UTX The “TX” in this pin name refers to the UART of the MCP2221. The LED_UTX pin is an indicator of UART TX characters being transmitted. This pin will pulse low or high (depending on the chip configuration settings; see the CHIPSETTING0 register for more details) for a period of time (a few milliseconds). This allows the application to provide a visual indication of the UART TX traffic. 1.7.1.6 LED_I2C The “I2C” in this pin name refers to the I2C module in the MCP2221. The LED_I2C pin is an indicator of I2C activity. This pin will pulse low or high (depending on the chip configuration settings; see the CHIPSETTING0 register for details) for a period of time (a few milliseconds). This allows the application to provide a visual indication of the I2C traffic. 1.7.1.7 ADC1/2/3 When GP1/2/3 are configured for ADC operation, they will work as analog input pins and they are tied to the first three channels of the 10-bit ADC in the MCP2221. 1.7.1.8 DAC1/2 When GP2/3 are configured for DAC operation, they will work as analog output pins and they are tied to the output of the MCP2221’s 5-bit DAC. TABLE 1-5: GP DESIGNATION TABLE GP Designation Bits <2:0> Assignment GP0 GP1 GP2 GP3 000 GPIO GPIO GPIO GPIO GPIO 001 DEDICATED_FUNC SSPND CLK OUT USBCFG LED_I2C 010 ALT_FUNC_0 LED_URX ADC1 ADC2 ADC3 011 ALT_FUNC_1 — LED_UTX DAC1 DAC2 100 ALT_FUNC_2 — IOC — — |
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