OKI
ML2502
n Record/Playback Operation
ML2502 has two record/playback modes, Dual-phrase record/playback mode and Single-
phrase record/playback mode. While in Dual-phrase record/playback mode the total memory
space is divided evenly into two areas for 2-phrase record/playback, the entire memory space
is used for one phrase record/playback in Single-phrase record/playback mode.
In Dual-phrase record/playback mode the first half of the memory, i.e. from the top address up
to the center address, is assigned to Phrase 1, and the second half, i.e. from the center
address to the last address, is assigned to Phrase 2. Record/playback of Phrase 1 can be
controlled via the REC1 and PLAY1 pins, while Phrase 2 can be controlled via the REC2 and
PLAY2 pins respectively.
In Single-phrase mode record/playback must be performed with the REC1 being connected to
the REC2 pin and the PLAY1 being connected to the PLAY2 pin respectively.
In both playback modes repetitive playback function for the same phrase is available.
1. Dual-Phrase Record/Playback Mode
1.1 Phrase 1 Recording Operation
(1)
Keep on inputting “H” level to the REC1 pin to power up and start recording from the top
address of the memory. Recording goes on while the REC1 pin being held “H” level.
The LSI automatically ends recording when the center address has been reached.
The LSI automatically shifts to low-power consumption mode after recording ends.
To stop recording for phrase 1 before reaching the center address, bring the REC1 pin
down to “L” level. The LSI automatically shifts to low-power consumption mode after
recording stops.
(2)
(3)
(4)
(5)
During recording operation any signal input to other pins than the REC1 is disregarded.
Note: Re-recording always causes to overwrite the existing recording data for a given
phrase.
Start
Invalid Input
Stop
REC1
REC2
MON
Power Down
Powering Up
Recording
Powering Down
Power Down
Status
Stopping Process
Figure 1.1 Timing Chart for Phrase 1 Recording Operation
ML2502 Data Sheet (Revision 8.0)
4
OKI [ OKI ELECTRONIC COMPONETS ]
