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DS1305 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1305 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 22 page DS1305 5 of 22 RTC AND RAM ADDRESS MAP The address map for the RTC and RAM registers of the DS1305 is shown in Figure 2. Data is written to the RTC by writing to address locations 80h to 9Fh and is written to the RAM by writing to address locations A0h to FFh. RTC data is read by reading address locations 00h to 1Fh and RAM data is read by reading address locations 20h to 7Fh. ADDRESS MAP Figure 2 00H 1FH CLOCK/CALENDAR READ ADDRESSES ONLY 20H 7FH 96-BYTES USER RAM READ ADDRESSES ONLY 80H 9FH CLOCK/CALENDAR WRITE ADDRESSES ONLY A0H FFH 96-BYTES USER RAM WRITE ADDRESSES ONLY CLOCK, CALENDAR AND ALARM The time and calendar information is obtained by reading the appropriate register bytes. The real time clock registers are illustrated in Figure 3. The time, calendar and alarm are set or initialized by writing the appropriate register bytes. Note that some bits are set to zero. These bits will always read 0 regardless of how they are written. Also note that registers 12h to 1Fh (read) and registers 92h to 9Fh are reserved. These registers will always read 0 regardless of how they are written. The contents of the time, calendar and alarm registers are in the binary-coded decimal (BCD) format. Please note that the initial power on state of all registers in not defined. Therefore it is important to enable the oscillator (EOSC = 0) and disable write protect (WP = 0) during initial configuration. |
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