FEDL2502-03
OKI Semiconductor
ML2502
Phrase 1 Erasing Operation
(1) To start erasing Phrase 1, input a “H” pulse to the REC1 pin while inputting “H” level to the ERASE pin.
(2) When erasing Phrase 1 is complete, the LSI automatically powers down, entering a low-power-consumption
state.
Note: You can’t stop erasing operation half way once getting started.
Technically speaking, erasing Phrase 1 means recording silence to a 250-address space starting from the top
address of the memory. Therefore, if you perform play operation right after erasing, the LSI plays silence from the
top address of the memory up to 250-address space and then stops playing automatically.
Start pulse
ERASE
REC1
MON
Power Down
Powering UP
Erasing
Power Down
Shifting to Power-down
Figure 7 Phrase 1 Erasing Operation Timing Chart
Phrase 2 Recording Operation
(1) To power up the LSI and start recording Phrase 2 from the center address of the memory, keep inputting “H”
level to the REC2 pin. Recording goes on while the REC2 pin stays “H”.
(2) The LSI automatically stops recording when the last address of the memory has been reached.
(3) When recording is complete, the LSI automatically powers down, entering a low-power-consumption state.
(4) To stop recording phrase 2 half way, bring the REC2 pin to “L” level. When recording is complete, the LSI
automatically powers down, entering a low-power-consumption state.
Note:Recording operation lets the LSI overwrite the existing data in memory area of each phrase, which means the
previously recorded data is erased whenever new recording is made.
Start recording
REC2
MON
Power Down
Powering UP
Recording
Power Down
Shifting to Power-down
Post-Recording Process
Stop recording
Figure 8 Phrase 2 Recording Operation Timing Chart
7/31
OKI [ OKI ELECTRONIC COMPONETS ]
