Rainbow Electronics DS1629 - Manual (Page 19)

DS1629
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Sample Command Sequence Table 10
Example: Assuming the DS1629 is configured such that the clock is running and the thermometer is
converting, read
the current time and temperature. Also read the status of the alarm flags.
BUS MASTER
MODE
DS1629
MODE
DATA (MSB
FIRST) COMMENTS
TX RX START Bus Master initiates a START condition
TX RX 9Eh Bus Master sends DS1629 address; R/ W = 0
RX TX ACK DS1629 generates acknowledge bit
TX RX AAh Bus Master sends read temperature protocol
RX TX ACK DS1629 generates acknowledge bit
TX RX START Bus Master initiates a Repeated START condition
TX RX 9Fh Bus Master sends DS1629 address; R/ W = 1
RX TX ACK DS1629 generates acknowledge bit
RX TX DS1629 generates MSB of temperature
TX RX ACK Bus Master generates acknowledge bit
RX TX DS1629 generates LSB of temperature
TX RX NACK Master generates no-acknowledge bit
TX RX START Bus Master initiates a repeated START condition
TX RX 9Eh Bus Master sends DS1629 address; R/ W = 0
RX TX ACK DS1629 generates acknowledge bit
TX RX C0h Bus Master sends access clock protocol
RX TX ACK DS1629 generates acknowledge bit
TX RX 01h Bus Master set clock register address to “minutes”
RX TX ACK DS1629 generates acknowledge bit
TX RX START Bus Master initiates a Repeated START condition
TX RX 9Fh Bus Master sends DS1629 address; R/ W = 1
RX TX ACK DS1629 generates acknowledge bit
RX TX DS1629 generates minutes
TX RX ACK Bus Mastergenerates acknowledge bit
RX TX DS1629 generates hours and clock mode
TX RX ACK Bus Master generates acknowledge bit
• • • •
RX TX DS1629 generates year
TX RX NACK Master generates no-acknowledge bit
TX RX START Bus Master initiates a repeated START condition
TX RX 9Eh Bus Master sends DS1629 address; R/ W = 0
RX TX ACK DS1629 generates acknowledge bit
TX RX ACh Bus Master sends access configuration protocol
RX TX ACK DS1629 generates acknowledge bit
TX RX 9Fh Bus Master sends DS1629 address; R/ W = 1
RX TX ACK DS1629 generates acknowledge bit
RX TX DS1629 generates MSB of configuration register
TX RX ACK Master generates acknowledge bit
RX TX DS1629 generates LSB of configuration register
(flags)
TX RX NACK Master generates no-acknowledge bit
TX RX STOP Bus Master initiates STOP condition