hcs362 Microchip Technology Inc., hcs362 Datasheet - Page 19

• Manufacturer Part Number: hcs362
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

4.6
In Synchronous mode, the code word can be clocked
out on DATA using S2 as a clock. To enter Synchro-
nous mode, DATA and S0 must be taken HIGH and
then S2 is taken HIGH. After Synchronous mode is
FIGURE 4-1:
FIGURE 4-2:
MSb
2002 Microchip Technology Inc.
DATA
S2
S[1:0]
QUEUE
RFEN
(2 bits)
SYNCHRONOUS MODE
T
PS
(2 bits)
CRC
T
PH
1 T
SYNCHRONOUS TRANSMISSION MODE
CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)
(1-bit)
Vlow
PH
“01,10,11”
2
T
RFON
S2 S1 S0 S3
Fixed Portion
Button
Status
t = 50ms
Serial Number
Preliminary
(28 bits)
entered, S0 must be taken LOW. The data is clocked
out on DATA on every rising edge of S2. Auto-shutoff
timer is not disabled in Synchronous mode. This can be
used to implement RF testing.
Preamble
S2 S1 S0 S3
Button
Status
Header
Encrypted Portion
DISC+ OVR
(12 bits)
69 Data bits
Transmitted
LSb first.
HCS362
DS40189D-page 19
Sync Counter
(16 bits)
Data
LSb