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数据搜索系统，热门电子元器件搜索 |
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STMPE2403 数据表(PDF) 35 Page - STMicroelectronics |
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STMPE2403 数据表(HTML) 35 Page - STMicroelectronics |
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35 / 63 page  STMPE2403 GPIO controller 35/63 10.2 GPIO Alternate Function Register (GPAFR) GPAFR is to select the functionality of the GPIO pin. To select a function for a GPIO pin, a bit-pair in the register (GPAFR_U or GPAFR_L) has to be set. GPAFR_U_msb Bit 23 22212019181716 AF23 AF22 AF21 AF20 R/W RWRWRWRW RW RW RW RW Reset Value 0000000 0 GPAFR_U_csb Bit 15 1413121110 9 8 AF19 AF18 AF17 AF16 R/W RWRWRWRW RW RW RW RW Reset Value 0000000 0 GPAFR_U_lsb Bit 7654321 0 AF15 AF14 AF13 AF12 R/W RWRWRWRW RW RW RW RW Reset Value 0000000 0 Table 34. Bit description Bits Name Description 23:0 AF[x] GPIO Pin ‘x’ Alternate Function Select (where x = 23 to 12). ‘00’ – The corresponding GPIO pin (GPIO[x]) is configured to Primary Function. ‘01’ – The corresponding GPIO pin (GPIO[x]) is configured to Alternate Function 1. ‘10’ – The corresponding GPIO pin (GPIO[x]) is configured to Alternate Function 2. ‘11’ – The corresponding GPIO pin (GPIO[x]) is configured to Alternate Function 3. |
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