Functional Description

Operation

(TE for the HT12E or D8~D11 for the HT12A, active low). This cycle will repeat itself as long as the

transmission enable (TE or D8~D11) is held low. Once the transmission enable returns high the en-

coder output completes its final cycle and then stops as shown below.

HT12A/HT12E

6

April 11, 2000

4 w o r d s

4 w o r d s

E n c oder

DO UT

T r ans m i t t ed

C ont i nuo us l y

< 1 w o r d

TE

Transmission timing for the HT12E

E n c oder

DO UT

T r a n s m i tte d

C o nt i n uo us l y

< 1 w o r d

D8 ~ D 1 1

Ke y - i n

1 w o r d

w i t h 3 8k H z c ar r i er

1 w o r d

Transmission timing for the HT12A (L/MB=Floating or VDD)

E n c oder

DO UT

T r ans m i t t e d

C ont i nuo us l y

D8 ~ D 1 1

Ke y - i n

1 w o r d

< 1 w o r d

7 w o r d s

1 w o r d

7 w o r d s

( a l l dat a= 1)

( a l l dat a= 1)

Transmission timing for the HT12A (L/MB=VSS)