Rainbow Electronics ISD14B20 - Manual (Page 4)

ISD14B20
Publication Release Date: October 9, 2007
- 4 - Revision 0
2.1. Address trigger operational mode
• While in mode, flexible message duration is defined by start address and end
address.
NORM
• Utilize four start addresses ( , , & ) and four end addresses ( , , & ) to
specific the message duration.
S0 S1 S2 S3 E0 E1 E2 E3
•
REC : Level-hold or Edge-trigger (toggle on-off) recording from start to end addresses.
•
PLAYE : Edge-trigger playback from start to end addresses and stops at EOM marker, if EOM
is prior to end address. Toggle on-off.
•
PLAYL : Level-hold playback from start to end addresses. Also, if constantly Low, device will
loop playback from start to end addresses.
2.2. Direct trigger operational mode
• While
MODE is active, utilizing, FMC1 , & FMC3 , the device reconfigures some pins to
adapt various (1 to 8) fixed equal message configurations for random access and pre-defines
the fixed message duration accordingly.
FMC2
• The control pins are:
M1 ~ M8 (message activation) and /P R (record or playback selection).
• The record or playback operation is pre-defined by the
/P R pin.
• Each message can be randomly accessed via its message control pin (
M1 ~ M8 ) and the
desired operation is facilitated accordingly.