SAN3010

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PAGE

3

LOC

OBJ

LINE

SOURCE

4029 F590

106

mov

P1,A

; 1 cycle

107

108

;--------------------------------------------------------------

109

;-- Delay 3:wait 321 us = 295 machine cycles and force RowY low

402B 7991

110

delay3: mov

R1,#145

; 1 cycle

402D D9FE

111

djnz

R1,$

; 2 cycles;#Loops=(295-5)/2=145

112

402F 00

113

SCAN2:

NOP

; 1 cycle

4030 7480

114

mov

A,#ForceLO

; 1 cycle

4032 4E

115

orl

A,R6

; 1 cycle

4033 F590

116

mov

P1,A

; 1 cycle

117

118

;--------------------------------------------------------------

119

;Delay 4: wait 321us= 295 machine cycles +disable all rows/cols

4035 7992

120

delay4: mov

R1,#146

; 1 cycle

4037 D9FE

121

djnz

R1,$

; 2 cycles;#Loops=(295-3)/2=146

4039 7488

122

mov

A,#Disable

; 1 cycle

403B F590

123

mov

P1,A

; 1 cycle

124

125

;--------------------------------------------------------------

126

;--- Delay 5:wait 321 us = 295 machine cycles + force ColX high

403D 7991

127

delay5: mov

R1,#145

; 1 cycle

403F D9FE

128

djnz

R1,$

; 2 cycles;#Loops=(295-5)/2=145

129

4041 00

130

SCAN3:

NOP

; 1 cycle

4042 7490

131

mov

A,#ForceHi

; 1 cycle

4044 4F

132

orl

A,R7

; 1 cycle

4045 F590

133

mov

P1,A

; 1 cycle

134

;--------------------------------------------------------------

135

;Delay 6:wait 107.25us=99 machine cycles +disable all rows/cols

4047 7930

136

delay6: mov

R1,#48

; 1 cycle

4049 D9FE

137

djnz

R1,$

; 2 cycles;#Loops=(99-3)/2 = 48

404B 7488

138

mov

A,#Disable

; 1 cycle

404D F590

139

mov

P1,A

; 1 cycle

140

141

;--------------------------------------------------------------

404F 0B

142

inc

R3

; increment loop counter

4050 BB09C1

143

cjne

R3,#9,Sync

; repeat loop 9 times

144

145

146

;----- Delay 7:

wait >15444 us = 14233 machine cycles before

147

;-----

next key entry

148

;----- Remark:

when cascading memory keys (M1...M10, Mem)

149

;----- dialling of a subsequent stored number is only accepted

150

;----- when the previous number has been fully dialled out.

151

;----- Example1: key entry is

"M1","M2"

152

;-----

M2 is only detected when M1 has completed dialing

153

;-----

its stored number, a delay has to be added between

154

;-----

key entries

155

;----- Example2: key entry is

"M1","0"

156

;----

numbers are stored in FIFO ,so they can be entered

157

;-----

immediately after a Memory entry, no additional

158

;-----

delay necessary

4053 7900

159

delay7: mov

R1,#0

;

4055 7A1C

160

mov

R2,#28