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AN2595 Datasheet(PDF) 10 Page - STMicroelectronics |
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AN2595 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 20 page Port0 startup configuration AN2595 - Application note 10/20 Table 2. Clock options on PORT0 P0H.5/.7 for devices with low-power oscillator P0H.7 P0H.6 P0H.5 CPU frequency fCPU = fXTAL x F External clock input range(1) 1. The external clock input range refers to a CPU clock range of 1...64 MHz. Notes 11 1 fXTAL x 4 4 to 8 MHz Default configuration 11 0 fXTAL x 3 5.3 to 8 MHz 10 1 fXTAL x 8 4 to 8 MHz 10 0 fXTAL x 5 6.4 to 8 MHz 01 1 fXTAL x 1 1 to 64 MHz Direct drive(2) 2. The maximum input frequency depends on the duty cycle of the external clock signal (refer to the latest datasheet). 01 0 fXTAL x 10 4 to 6.4 MHz 00 1 fXTAL x 0.5 4 to 8 MHz CPU clock via prescaler(3) 3. The limit on input frequency is 4 to 8 MHz since the usage of the internal oscillator amplifier is required. Also, when the PLL is not used and the CPU clock corresponds to FXTAL/2, an external crystal or resonator should be used: It is not possible to force any clock with an external clock source. 00 0 fXTAL x 16 4 MHz Table 3. Clock options on PORT0 P0H.5 /.7 for devices with wide-swing oscillator P0H.7 P0H.6 P0H.5 CPU frequency fCPU = fXTAL x F External clock input range(1) 1. The external clock input range refers to a CPU clock range of 1...64 MHz. Notes 11 1 fXTAL x 4 4 to 8 MHz Default configuration 11 0 fXTAL x 3 5.3 to 10.6 MHz 10 1 fXTAL x 8 4 to 8 MHz 10 0 fXTAL x 5 6.4 to 12 MHz 01 1 fXTAL x 1 1 to 64 MHz Direct drive(2) 2. The maximum input frequency depends on the duty cycle of the external clock signal (refer to the latest datasheet). 01 0 fXTAL x 10 4 to 6.4 MHz 00 1 fXTAL x 0.5 4 to 12 MHz CPU clock via prescaler(3) 3. The limit on input frequency is 4 to 12 MHz since the usage of the internal oscillator amplifier is required. Also when the PLL is not used and the CPU clock corresponds to FXTAL/2, an external crystal or resonator shall be should be used: It is not possible to force any clock with an external clock source. 00 0 fXTAL x 16 4 MHz |
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