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DS1307Z Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS1307Z Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 11 page DS1307 4 of 11 The DS1307 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24-hour mode, bit 5 is the second 10 hour bit (20- 23 hours). On a 2-wire START, the current time is transferred to a second set of registers. The time information is read from these secondary registers, while the clock may continue to run. This eliminates the need to re- read the registers in case of an update of the main registers during a read. DS1307 TIMEKEEPER REGISTERS Figure 3 CONTROL REGISTER The DS1307 Control Register is used to control the operation of the SQW/OUT pin. BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 OUT X X SQWE X X RS1 RS0 OUT (Output control): This bit controls the output level of the SQW/OUT pin when the square wave output is disabled. If SQWE=0, the logic level on the SQW/OUT pin is 1 if OUT=1 and is 0 if OUT=0. SQWE (Square Wave Enable): This bit, when set to a logic 1, will enable the oscillator output. The frequency of the square wave output depends upon the value of the RS0 and RS1 bits. RS (Rate Select): These bits control the frequency of the square wave output when the square wave output has been enabled. Table 1 lists the square wave frequencies that can be selected with the RS bits. SQUAREWAVE OUTPUT FREQUENCY Table 1 RS1 RS0 SQW OUTPUT FREQUENCY 00 1 Hz 0 1 4.096 kHz 1 0 8.192 kHz 1 1 32.768 kHz |
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