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ST7FOXK2 数据表(PDF) 47 Page - STMicroelectronics |
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ST7FOXK2 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 226 page  ST7FOXF1, ST7FOXK1, ST7FOXK2 Supply, reset and clock management 47/226 6.5.3 RC Control Register High (RCCRH) Reset value: 1111 1111 (FFh) Bits 7:0 = CR[9:2] RC Oscillator Frequency Adjustment bits These bits must be written immediately after reset to adjust the RC oscillator frequency. The application can store the correct value for each voltage range in Flash memory and write it to this register at start-up. 00h = maximum available frequency FFh = lowest available frequency These bits are used with the CR[1:0] bits in the RCCRL register. Refer to Chapter 6.5.4. Note: To tune the oscillator, write a series of different values in the register until the correct frequency is reached. The fastest method is to use a dichotomy starting with 80h. 7 0 CR9 CR8 CR7 CR6 CR5 CR4 CR3 CR2 Read/write |
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