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ST8500 数据表(PDF) 24 Page - STMicroelectronics |
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ST8500 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 37 page ![]() Pinout and pin description ST8500 24/37 DocID031029 Rev 3 3.2 GPIOs multiplexing scheme In the ST8500 device, peripherals are connected to I/Os through a multiplexer. At a given time, each I/O can be controlled by only one single peripheral. In this way, there is no conflict between peripherals sharing the same I/O pins. Thanks to a set of configuration registers, the user can select one of the three possible alternate functions for each pin as described in Table 8. Table 8. GPIOs multiplexing scheme Pin name Selection: 11 Selection: 00 Selection: 01 Selection: 10 GPIO00_0 Input/output USART1_RX SPI2_SCLK RESERVED GPIO00_1 Input/output USART1_TX SPI2_MOSI RESERVED GPIO00_2 Input/output USART1_RTS SPI2_SSn RESERVED GPIO00_3 Input/output USART1_CTS SPI2_MISO RESERVED GPIO00_4 Input/output USART0_RX SPI0_SCLK RESERVED GPIO00_5 Input/output USART0_TX SPI0_MOSI RESERVED GPIO00_6 Input/output USART0_RTS SPI0_SSn RESERVED GPIO00_7 Input/output USART0_CTS SPI0_MISO RESERVED GPIO01_0 Input/output SPI1_SCLK - RESERVED GPIO01_1 Input/output SPI1_MOSI - RESERVED GPIO01_2 Input/output SPI1_SSn USART0_SCLK RESERVED GPIO01_3 Input/output SPI1_MISO - RESERVED GPIO01_4 Input/output USART2_RX I2C0_SMBA RESERVED GPIO01_5 Input/output USART2_TX USART1_SCLK RESERVED GPIO01_6 Input/output USART2_RTS I2C0_SDA RESERVED GPIO01_7 Input/output USART2_CTS I2C0_SCL RESERVED GPIO03_0 Input/output BOOT0 - RESERVED GPIO03_1 Input/output BOOT1 - RESERVED GPIO03_2 Input/output BOOT2 - RESERVED GPIO03_3 Input/output JTAG_TMS/SWIO - RESERVED GPIO03_4 Input/output JTAG_TCK/SWCLK - RESERVED GPIO03_5 Input/output JTAG_TDO/SWV - RESERVED GPIO03_6 Input/output JTAG_TRSTn - RESERVED GPIO03_7 Input/output JTAG_TDI - RESERVED |
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