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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72324BJ2 датащи(PDF) 65 Page - STMicroelectronics |
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ST72324BJ2 датащи(HTML) 65 Page - STMicroelectronics |
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65 / 188 page  ST72324B On-chip peripherals 65/188 10.2.2 Clock-out capability The clock-out capability is an alternate function of an I/O port pin that outputs the fCPU clock to drive external devices. It is controlled by the MCO bit in the MCCSR register. Caution: When selected, the clock out pin suspends the clock during Active Halt mode. 10.2.3 Real-time clock (RTC) timer The counter of the real-time clock timer allows an interrupt to be generated based on an accurate real-time clock. Four different time bases depending directly on fOSC2 are available. The whole functionality is controlled by four bits of the MCCSR register: TB[1:0], OIE and OIF. When the RTC interrupt is enabled (OIE bit set), the ST7 enters Active Halt mode when the HALT instruction is executed. See Section 8.4: Active Halt and Halt modes on page 49 for more details. 10.2.4 Beeper The beep function is controlled by the MCCBCR register. It can output three selectable frequencies on the Beep pin (I/O port alternate function). Figure 35. Main clock controller (MCC/RTC) block diagram Div 2, 4, 8, 16 MCC/RTC interrupt SMS CP1 CP0 TB1 TB0 OIE OIF CPU clock MCCSR 12-bit MCC RTC counter to CPU and peripherals fOSC2 fCPU MCO MCO BC1 BC0 MCCBCR Beep selection Beep signal 1 0 To Watchdog timer Div 64 |
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