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AN665 Datasheet(PDF) 8 Page - Microchip Technology

Part # AN665
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

AN665 Datasheet(HTML) 8 Page - Microchip Technology

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AN665
DS00665A-page 8
ã 1997 Microchip Technology Inc.
00049 #define HCSIN
GPIO,4
; PWM from HCS300
00050 #define NC
GPIO,3
; not used
00051 #define SWITCH
GPIO,2
; sense clock line to/from PC
00052 #define DATA
GPIO,1
; data to PC
00053
00054 #define PCCLK
0
; clock to PC
00055
00056 #define MASKDEF
bÕ11111011Õ ; only SWITCH pin in output
00057 #define MASKLOW
bÕ11111001Õ ; prepare data low
00058 #define MASKHIGH
bÕ11111011Õ ; prepare data high
00059
00060 ;
00061 ; RAM assignments
00062 ;
00063
CBLOCK
07
00000007
00064
BUFFER0
; receive buffer for hcs300
00000008
00065
BUFFER1
00000009
00066
BUFFER2
0000000A
00067
BUFFER3
0000000B
00068
BUFFER4
0000000C
00069
BUFFER5
0000000D
00070
BUFFER6
0000000E
00071
BUFFER7
0000000F
00072
BITCOUNT
; counters
00000010
00073
BYTECOUNT
;
00000011
00074
TIMEHI
; timing
00000012
00075
TIMELO
;
00000013
00076
PARITY
; transmission parity bit
00000014
00077
AUX
; g.p.
00000015
00078
KEY
; key to encode
00000016
00079
GPIOTEMP
; temp copy of tris register
00080
ENDC
00081 ;----------------------------------------------------------------------
00082
0000
00083
ORG
0
00084
0000
00085 Start
0000 0025
00086
movwf
OSCCAL
; calibrate
0001 0A7A
00087
goto
Main
00088
00089 ;----------------------------------------------------------------------
00090 ; keyscan table
00091 ;
0002
00092 ScanCode
0002 01E2
00093
addwf
PCL,F
0003 0845
00094
retlw
45
; key Ô0Õ
0004 0816
00095
retlw
16
; key Ô1Õ
0005 081E
00096
retlw
1E
; key Ô2Õ
0006 0826
00097
retlw
26
; key Ô3Õ
0007 0825
00098
retlw
25
; key Ô4Õ
0008 082E
00099
retlw
2E
; key Ô5Õ
0009 0836
00100
retlw
36
; key Ô6Õ
000A 083D
00101
retlw
3D
; key Ô7Õ
000B 083E
00102
retlw
3E
; key Ô8Õ
000C 0846
00103
retlw
46
; key Ô9Õ
000D 081C
00104
retlw
1C
; key ÔAÕ
000E 0832
00105
retlw
32
; key ÔBÕ
000F 0821
00106
retlw
21
; key ÔCÕ
0010 0823
00107
retlw
23
; key ÔDÕ
0011 0824
00108
retlw
24
; key ÔEÕ
0012 082B
00109
retlw
2B
; key ÔFÕ
00110
00111 #define
BREAK
0F0
; break scan code
00112
00113 ;**********************************************************************
00114 ;*
SubDelay


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