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AN662 Datasheet(PDF) 11 Page - Microchip Technology

Part # AN662
Description  USING KEELOQ짰 TO GENERATE HOPPING PASSWORDS
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

AN662 Datasheet(HTML) 11 Page - Microchip Technology

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ã 1997 Microchip Technology Inc.
DS00665A-page 11
AN665
00247 ;*
Output Variables:
00248 ;*
BUFFER0..7
00249 ;**********************************************************************
00250 ;
004A
00251 Receive
004A 0686
00252
btfsc
HCSIN
; wait for a falling edge
004B 0A4A
00253
goto
Receive
00254
00255 ; will accept sync pulses from
3.0 to 6.1 ms.
00256 ; more than 128 cycles but less than 256
00257 ; each cycle is 24 us @4MHz
00258 ;
00000038
00259 PREBIT
EQU
.56
00260
004C 006F
00261
clrf
BITCOUNT
; init counter
004D
00262 Rise
004D 0686
00263
btfsc
HCSIN
; wait rising edge
004E 0A54
00264
goto
Rise2
00265
004F 0913
00266
call
SubDelay10
; 24us per cycle
0050 0914
00267
call
SubDelay9
;
00268
0051 03EF
00269
incfsz
BITCOUNT,F
; more than 6,0ms timeout
0052 0A4D
00270
goto
Rise
; waiting loop
0053 0A4A
00271
goto
Receive
; timeout restart
00272
0054
00273 Rise2
0054 07EF
00274
btfss
BITCOUNT,7
; if bit7=1 ok
0055 0A4A
00275
goto
Receive
; else less than
3.0 ms timeout
00276
00277 ;-------------------------------------------------------------------
00278 ; read folowing 8 bytes (ignore last 2 bit)
00279 ;
0056 0C40
00280
movlw
.64
; 8 bit per byte
0057 002F
00281
movwf
BITCOUNT
;
00282
0058
00283 FirstPreload
0058 0C38
00284
movlw
PREBIT
; first bit needs no balance
0059 0031
00285
movwf
TIMEHI
005A 0A5D
00286
goto
WHL
00287
005B
00288 RNextBit
005B 0C36
00289
movlw
PREBIT-2
; preload counter
005C 0031
00290
movwf
TIMEHI
; balance extra rrf time
00291
005D
00292 WHL
005D 02B1
00293
incf
TIMEHI,F
; measure high period
005E 0643
00294
btfsc
STATUS,Z
005F 0A4A
00295
goto
Receive
; after 1.2ms (200*6) timeout
0060 0686
00296
btfsc
HCSIN
; loop while High
0061 0A5D
00297
goto
WHL
;
00298
0062 0C38
00299
movlw
PREBIT
; preload counter
0063 0032
00300
movwf
TIMELO
00301
0064
00302 WLL
0064 02B2
00303
incf
TIMELO,F
; measure low period
0065 0643
00304
btfsc
STATUS,Z
0066 0A4A
00305
goto
Receive
; after 1.2ms (200*6) timeout
0067 0786
00306
btfss
HCSIN
; loop while Low
0068 0A64
00307
goto
WLL
00308
00309 ; shift in the new bit
0069 0211
00310
movf
TIMEHI,W
006A 00B2
00311
subwf
TIMELO,F
; if TIMEHI > TIMELO Carry = 0
006B 032E
00312
rrf
BUFFER7,F
; insert bit in buffer


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