W51300

Publication Release Date: April 1997

- 5 -

Revision A2

3. Selective Erase

When the system is operated in multi-segment mode, voice segments can be erased selectively

instead of sequentially. Users can play the voice segments one by one until they reach the segment

to be erased, and then stop playing and press the ERASE key. The current voice segment will be

erased and the CAP value will be changed to the previous voice segment. The LED will light during

the erasing procedure to indicate that the system is busy, and all input triggers will be disabled except

for RESET.

4. Chip Erase

Pressing and holding the RESET key for more than two seconds will clear all data in the flash

EPROM.

5. Function Keys

In normal mode, eight input trigger pins with built-in debounce circuitry are used to operate the

W51300. These eight pins are described below.

L_REC

L_REC is an active-high, level-triggered recording pin with an internal 500 K

Ω pull-low resistor. When

this pin goes high, the device starts recording and continues until this pin is released or the end of the

memory space is reached. When the memory or segment is full, this pin is invalid.

E_PLAY

E_PLAY is an active-high, edge-triggered playback pin with an internal 500 K

Ω pull-low resistor. In

single segment operation, the toggle stop function is enabled. This means a debounced rising edge

on E_PLAY during voice playing will stop the ongoing playback operation immediately. In multi-

segment operation, the toggle skip function is enabled. This means a debounced rising edge on

E_PLAY during voice playing will cause the device to skip to the next voice segment. A rising edge

on this pin while the last voice segment is being played will cause the device to skip to the first voice

segment. This function is useful for fast scanning through a series of messages.

L_ PLAY

L_PLAY is an active-high, level-triggered playback pin with an internal 500 K

Ω pull-low resistor. The

current voice segment will be played back when this pin is pressed. A concatenated loop playing

function is enabled to link all messages in a row and loop back to the first message when the last

message is reached.

STOP

This is an active-high, edge-triggered stop pin with an internal 500 K

Ω pull-low resistor. Pressing this

pin immediately stops playback of the ongoing message. This pin is enabled only while a voice is

playing.

ERASE

ERASE is an active-high, edge-triggered erase pin with an internal 500 K

Ω pull-low resistor. Pressing

this pin erases the current voice segment without affecting the content of the other segments.

FWD

This is an active-high, edge-triggered forward pin with an internal 500 K

Ω pull-low resistor. Pressing

this pin for less than 1 second moves the CAP from the current voice segment to the next one.

Pressing this pin for more than 1 second moves the CAP from the current voice segment to the last

one.