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ST7LITE02 Datasheet(PDF) 24 Page - STMicroelectronics |
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ST7LITE02 Datasheet(HTML) 24 Page - STMicroelectronics |
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24 / 122 page  ST7LITE0, ST7SUPERLITE 24/122 Figure 12. PLL Output Frequency Timing Diagram When the PLL is started, after reset or wakeup from Halt mode or AWUFH mode, it outputs the clock after a delay of tSTARTUP. When the PLL output signal reaches the operating frequency, the LOCKED bit in the SICSCR register is set. Full PLL accuracy (ACCPLL) is reached after a stabilization time of tSTAB (see Figure 12 and 13.3.4 Internal RC Oscillator and PLL) Refer to section 7.5.4 on page 32 for a description of the LOCKED bit in the SICSR register. 7.3 REGISTER DESCRIPTION MAIN CLOCK CONTROL/STATUS REGISTER (MCCSR) Read / Write Reset Value: 0000 0000 (00h) Bits 7:2 = Reserved, must be kept cleared. Bit 1 = MCO Main Clock Out enable This bit is read/write by software and cleared by hardware after a reset. This bit allows to enable the MCO output clock. 0: MCO clock disabled, I/O port free for general purpose I/O. 1: MCO clock enabled. Bit 0 = SMS Slow Mode select This bit is read/write by software and cleared by hardware after a reset. This bit selects the input clock fOSC or fOSC/32. 0: Normal mode (fCPU = fOSC 1: Slow mode (fCPU = fOSC/32) RC CONTROL REGISTER (RCCR) Read / Write Reset Value: 1111 1111 (FFh) Bits 7:0 = CR[7:0] RC Oscillator Frequency Ad- justment Bits These bits must be written immediately after reset to adjust the RC oscillator frequency and to obtain an accuracy of 1%. The application can store the correct value for each voltage range in EEPROM and write it to this register at start-up. 00h = maximum available frequency FFh = lowest available frequency Note: To tune the oscillator, write a series of differ- ent values in the register until the correct frequen- cy is reached. The fastest method is to use a di- chotomy starting with 80h. Table 5. Clock Register Map and Reset Values 70 00 00000 MCO SMS 4/8 x freq. LOCKED bit set tSTAB tLOCK input tSTARTUP t 70 CR70 CR60 CR50 CR40 CR30 CR20 CR10 CR0 Address (Hex.) Register Label 7654 3210 0038h MCCSR Reset Value 0000 00 MCO 0 SMS 0 0039h RCCR Reset Value CR70 1 CR60 1 CR50 1 CR40 1 CR30 1 CR20 1 CR10 1 CR0 1 1 |
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