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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87365 датащи(PDF) 126 Page - National Semiconductor (TI) |
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PC87365 датащи(HTML) 126 Page - National Semiconductor (TI) |
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126 / 215 page  5.0 Fan Speed Monitor (Continued) 126 www.national.com 5.3.2 Fan Monitor Threshold Register (FMTHR) This 8-bit register contains the programmable threshold for the fan. This threshold is the maximum number of clock cycles between consecutive tachometer pulses (frequencies of 16, 8, 4 or 2 KHz). It represents the minimum fan speed permitted in the system. If the period between consecutive tachometer pulses is greater than the threshold, an interrupt (if enabled) is issued. After reset, the value of FMTHR is FFh. This register should not be changed when the corresponding Fan Monitor Enable bit is set to 1 (enabled), since this may cause unpredictable results. Location: Device specific Type: R/W 5.3.3 Fan Monitor Speed Register (FMSPR) This read-only 8-bit register holds the speed reading, represented by number of clock cycles between consecutive tachom- eter pulses. For details, refer to Section 5.2. When the Speed Ready bit of the FMCSR register is 1, FMSPR holds valid data that has not yet been read. It is cleared to 00h upon any of the following conditions: q System reset. q Fan Monitor Enable bit is set to 0. q Overflow bit is set to 1. Location: Device specific Type: RO 5.3.4 Fan Monitor Control and Status Register (FMCSR) Location: Device specific Type: Varies per bit Bit 76543210 Name Threshold Value Reset 11111111 Bit 76543210 Name Fan Speed Reading Reset 00000000 Bit 76543210 Name Reserved Clock Select Filter Disable Interrupt Enable Overflow Over Threshold Speed Ready Reset 00100000 |
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