HCS512 Datasheet, PDF (10/20 Pages) Microchip Technology – KEELOQ CODE HOPPING DECODER

HCS512
FIGURE 6-2: PROGRAMMING WAVEFORMS
MCLR
T_PS
CLK
(Clock)
DAT
(Data)
T_PH1
T_PH2
T_CKL
T_CKH
T_ACK
Bit0 Bit1
Bit78 Bit79
Ack
Enter Program Mode
80-bit Data Package
Acknowledge
pulse
TABLE 6-4: PROGRAMMING TIMING
REQUIREMENTS
Parameter
Symbol
Program mode setup time
Hold time 1
Hold time 2
Clock High Time
Clock Low Time
Acknowledge Time
Note: FOSC equals 4 MHz.
TPS
TPH1
TPH2
TCKH
TCKL
TACK
Min.
1
8
0.05
0.05
0.050
—
Max.
64
128
320
320
320
80
Units
ms
ms
ms
ms
ms
ms
DS40151C-page 10
© 1997 Microchip Technology Inc.