DS1077L DALLAS [Dallas Semiconductor], DS1077L Datasheet - Page 12

• Manufacturer Part Number: DS1077L
• Description: 3V EconOscillator/Divider
• Manufacturer: DALLAS [Dallas Semiconductor]

COMMAND SET
Data and control information is read from and written to the DS1077L in the format shown in Figure 3. To
write to the DS1077L, the master will issue the slave address of the DS1077L and the R/
0. After receiving an acknowledge, the bus master provides a command protocol. After receiving this
protocol, the DS1077L will issue an acknowledge, and then the master can send data to the DS1077L. If the
DS1077L is to be read, the master must send the command protocol as before, and then issue a repeat
START condition and then the control byte again, this time with the R/
the data from the DS1077L.
The command set for the DS1077L is as follows:
Access DIV [01]
If R/
is to be written into the DIV register.
If R/
Access MUX [02]
If R/
is to be written into the MUX register.
If R/
Access BUS [0D]
If R/
is to be written into the BUS register.
If R/
Write E2 [3F]
If WC = 0, the EEPROM is automatically written to at the end of each command, this is a DEFAULT
condition. In this case the command WRITE E2 is not needed
If WC = 1, the EEPROM is only written when the WRITE E2 command is issued. On receipt of the WRITE
E2 command the contents of the DIV and MUX registers are written into the EEPROM, thus locking in the
register settings.
EXCEPTION: The BUS register is always automatically written to EEPROM after a write, regardless of
W
W
W
W
W
W
= 0, this command writes to the BUS register. After issuing this command, the next data byte value
= 1, the next data byte read is the value stored in the DIV register.
= 1, the next data byte read is the value stored in the MUX register.
= 1, the next data byte read is the value stored in the BUS register.
= 0, this command writes to the MUX register. After issuing this command, the next data byte value
= 0, this command writes to the DIV register. After issuing this command, the next data byte value
the value of WC.
12 of 20
W
bit set to one to allow reading of
W
bit will be set to