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STM32W108CB Datasheet(PDF) 41 Page - STMicroelectronics |
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STM32W108CB Datasheet(HTML) 41 Page - STMicroelectronics |
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41 / 179 page  STM32W108CB, STM32W108HB System modules Doc ID 16252 Rev 2 41/179 5.3.6 Clock switching registers XTAL or OSCHF main clock select register (OSC24M_CTRL) Address offset: 0x4000 401C Reset value: 0x0000 0000 CPU clock source select register (CPU_CLK_SEL) Address offset: 0x4000 4020 Reset value: 0x0000 0000 Table 3. System clock modes OSC24M_SEL CPU_CLK_SEL SCLK PCLK FCLK Flash Program/ Erase Inactive Flash Program/ Erase Active 0 (OSCHF) 0 (Normal CPU) 12 MHz 6 MHz 6 MHz 12 MHz 0 (OSCHF) 1 (Fast CPU) 12 MHz 6 MHz 12 MHz 12 MHz 1 (OSC24M) 0 (Normal CPU) 24 MHz 12 MHz 12 MHz 12 MHz 1 (OSC24M) 1 (Fast CPU) 24 MHz 12 MHz 24 MHz 12 MHz 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 rrr rrr r r r r r r r r r r 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 OSC24 M_EN OSC24 M_SEL rrr rrr r r r r r r r r rws rws 1 OSC24M_EN: When set to ‘1’, 24 MHz crystal oscillator is main clock. 0 OSC24M_SEL: When set to ‘0’, OSCHF is selected. When set to ‘1’, XTAL is selected. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 rrr rrr r r r r r r r r r r 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 CPU_C LK_SEL rrr rrr r r r r r r r r rws rws 0 CPU_CLK_SEL: When set to ‘0’, 12-MHz CPU clock is selected. When set to ‘1’, 24-MHz CPU clock is selected. Note that the clock selection also determines if RAM controller is running at the same speed as the HCLK (CPU_CLK_SEL = ‘1’) or double speed of HCLK (CPU_CLK_SEL = ‘0’). |
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