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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87413 датащи(PDF) 154 Page - National Semiconductor (TI) |
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PC87413 датащи(HTML) 154 Page - National Semiconductor (TI) |
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154 / 257 page  8.0 Real-Time Clock (RTC) (Continued) www.national.com 154 Revision1.2 8.3.13 RTC Control Register A (CRA) This register controls test selection in addition to other functions. This register cannot be written before reading bit 7 of the CRD register. Power Well:VPP Location: Index 0Ah Type: Varies per bit Table 37. Divider Chain Control and Test Selection Bit 76543210 Name Update in Progress Divider Chain Control Periodic Interrupt Rate Select Reset 00100000 Bit Type Description 7RO Update in Progress. This bit is not affected by reset. It reads 0 when bit 7 of the CRB register is 1. 0: Timing registers not updated within 244 µs 1: Timing registers updated within 244 µs 6-4 R/W Divider Chain Control. These bits control the configuration of the divider chain for timing generation (see Table 37). They are cleared to 000 as long as bit 7 of the CRD register reads 0. 3-0 R/W Periodic Interrupt Rate Select. These bits select one of 15 output taps from the clock divider chain to control the rate of the periodic interrupt (see Table 38 and Figure 41 on page 144). They are cleared to 000 as long as bit 7 of the CRD register reads 0. DV2 (CRA6) DV1 (CRA5) DV0 (CRA4) Configuration 0 0 X Oscillator Disabled 0 1 0 Normal Operation 011 Reserved 10 X 1 1 X Divider Chain Reset |
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