MK712STR Ver la hoja de datos (PDF) - Integrated Circuit Systems
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Fabricante
MK712STR Datasheet PDF : 16 Pages
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I CR O C LOC K
MK712
Touch Screen Controller
Rate Register (Register 7) Programming
Count
0 to 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
P.P.S.
Not Permitted
197
187
177
169
161
154
147
141
136
131
126
122
118
114
110
107
104
101
98
Count
28
29
30
31
32
33
34
35
40
45
50
55
60
65
70
75
80
85
90
95
P.P.S.
95
93
90
88
86
84
82
80
72
65
60
55
51
47
44
42
39
37
35
34
Count
100
105
110
115
120
125
130
135
140
145
150
155
165
175
185
195
205
225
235
255
P.P.S. = Points Per Second. With a 14.318 MHz clock.
Calculating Points Per Second
P.P.S.
32
31
29
28
27
26
25
24
24
23
22
21
20
19
18
17
16
15
14
13
The formula for determining P.P.S. is:
fin
P.P.S. =
35716 + (4096 x COUNT)
Where fin is the frequency
of the CLKIN input.
Power-On Reset
On application of power, an internal reset is generated that clears all bits in registers 0, 1, and 6. Register 7 is
set to 32 giving a rate of 86 PPS. Note that clearing register 6 puts the IC into the power down condition.
Initializing the MK712
The interrupt on the MK712 can only be cleared by reading a register or by writing register 6 to the
power down condition. After a fault condition, initialize the MK712 by writing register 6 to zero and
then writing register 6 to the desired value. This will always clear pending interrupts.
MDS 712 I
5
Revision 100899 Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race St.•San Jose•CA•95126•(408)295-9800tel•www.icst.com
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