Read / Write Eeprom Memory - Epson RTC-9701JE Applications Manual

RTC - 9701 JE

12.3. Read / Write EEPROM Memory

12.3.1. Write Enable mode (EWEN)
1) After power supply, please execute this once.
2) If data has been transferred while Busy, the Write Enable mode may be canceled. In this case, execute again the
Write Enable mode.
CE
CLK
m3 m2 m1
DI
0 1 1
mode
DO
12.3.2. Write EEPROM Memory
1) At power supply, set the Write Enable mode (Write Enable mode section [12.3.1.]).
2) After CE input rises, set the mode into the mode field (4 bits), and then make sure to set the segment bits (3 bits)
of the address field to 0 because these are used for memory expansion. Set the address into the next 8 bits, and
then set the following bit to "0". Finally, write the data in the data field.
* If the Busy/Ready signal is ignored, make sure to reserve t
CE
CLK
m1
m3 m2
1
0 0
Mode
12.3.3. Read EEPROM Memory
1) After setting the address, data can be transferred. This mode can be used only when the EEPROM Memory mode
is set.
2) After CE input rises, set the mode into the mode field (4 bits), and then make sure to set the segment bits (3 bits)
of the address field to 0 because these are used for memory expansion. Set the address into the next 8 bits, and
then set the following bit to "0". The next 16 bits data is output from DO.
* If the Busy/Ready signal is ignored, make sure to reserve 16 ms once every second.
CE
CLK
m3
m2 m1
DI
1
0 1
Mode setting reserved
DO
m0
0 X 1 0 0 1 1 X X
op
m0
a7 a6 a5 a4 a3 a2 a1 a0
0 0 0 0
reserved Address setting
m0
a7 a6 a5 a4 a3 a2 a1 a0 0
0 0 0 0
Address setting
X X X X
.
WNV
dF dE dD dC dB dA d9 d8 d7 d6 d5 d4 d3 d2 d1 d0
0
reserved
reserved
dF dE dD dC dB dA d9 d8 d7 d6 d5 d4 d3 d2 d1 d0
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Write data
Read data
MQ - 362 - 03