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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) 150 Page - National Semiconductor (TI) |
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PC87413 датащи(HTML) 150 Page - National Semiconductor (TI) |
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150 / 257 page  8.0 Real-Time Clock (RTC) (Continued) www.national.com 150 Revision1.2 8.3.2 RTC Runtime Register Map The RTC runtime registers can be accessed at any time during normal or standby operation; i.e., when VSB and/or VDD are within the recommended operation range. The access is disabled during battery-backed operation. Write operation to these registers is also disabled if bit 7 of the CRD register is 0 (see Section 8.3.16 on page 157). Note: Before attempting to perform any start-up procedures, read the explanation of bit 7 (VRT) of the CRD register (see Section 8.3.16 on page 157). See Section 8.6 on page 160 for a detailed description of the memory map for the RTC registers. This section describes the RTC Timing and Control registers that control basic RTC functionality. All registers are VPP pow- ered. 8.3.3 Seconds Register (SEC) Power Well:VPP Location: Index 00h Type: R/W Index Mnemonic Name Type Power Well Reset Section 00h SEC Seconds Register R/W VPP VPP PUR 8.3.3 01h SECA Seconds Alarm Register R/W VPP VPP PUR 8.3.4 02h MIN Minutes Register R/W VPP VPP PUR 8.3.5 03h MINA Minutes Alarm Register R/W VPP VPP PUR 8.3.6 04h HOR Hours Register R/W VPP VPP PUR 8.3.7 05h HORA Hours Alarm Register R/W VPP VPP PUR 8.3.8 06h DOW Day-of-Week Register R/W VPP VPP PUR 8.3.9 07h DOM Date-of-Month Register R/W VPP VPP PUR 8.3.10 08h MON Month Register R/W VPP VPP PUR 8.3.11 09h YER Year Register R/W VPP VPP PUR 8.3.12 0Ah CRA RTC Control Register A Varies per bit VPP Bit specific 8.3.13 0Bh CRB RTC Control Register B R/W VPP Bit specific 8.3.14 0Ch CRC RTC Control Register C R/O VPP Bit specific 8.3.15 0Dh CRD RTC Control Register D R/O VPP VPP PUR 8.3.16 Programmable1 by DOMAO 1. Overlaid on RAM bytes in range 0Eh-7Fh. DOMA Date-of-Month Alarm Register R/W VPP VPP PUR 8.3.17 Programmable1 by MONAO MONA Month Alarm Register R/W VPP VPP PUR 8.3.18 Programmable1 by CENO CEN Century Register R/W VPP VPP PUR 8.3.19 Bit 76543210 Name Seconds Data Reset 00000000 Bit Description 7-0 Seconds Data. Values may be 00 to 59 in BCD format or 00 to 3B in Binary format. |
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