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ST72344K2 датащи(PDF) 90 Page - STMicroelectronics |
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ST72344K2 датащи(HTML) 90 Page - STMicroelectronics |
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90 / 247 page ![]() On-chip peripherals ST72344xx, ST2345xx 90/247 Doc ID 12321 Rev 6 11.2.7 Register description MCC control/status register (MCCSR) Reset value: 0000 0000 (00h) Bit 7 = MCO Main clock out selection This bit enables the MCO alternate function on the PF0 I/O port. It is set and cleared by software. 0: MCO alternate function disabled (I/O pin free for general-purpose I/O) 1: MCO alternate function enabled (fCPU on I/O port) Note: To reduce power consumption, the MCO function is not active in Active-halt mode. Bits 6:5 = CP[1:0] CPU clock prescaler These bits select the CPU clock prescaler which is applied in the different slow modes. Their action is conditioned by the setting of the SMS bit. These two bits are set and cleared by software. Bit 4 = SMS Slow mode select This bit is set and cleared by software. 0: Normal mode. fCPU = fOSC2 1: Slow mode. fCPU is given by CP1, CP0 See Section 9.2: Slow mode and Section 11.1: Window watchdog (WWDG) for more details. Bits 3:2 = TB[1:0] Time base control These bits select the programmable divider time base. They are set and cleared by software. 7 0 MCO CP1 CP0 SMS TB1 TB0 OIE OIF Read/Write Table 41. CPU clock prescaler selection fCPU in Slow mode CP1 CP0 fOSC2 / 2 0 0 fOSC2 / 4 0 1 fOSC2 / 8 1 0 fOSC2 / 16 1 1 |
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