18
R-15AT
27 RESET IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter
set at "H" level.
28 P71 OUT Memory (EEPROM) clock output.
29 P70 IN/OUT Memory (EEPROM) data input/output.
30 XIN IN Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
31 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
32 VSS IN Connected to GND.
33 P27 IN Signal coming from touch key.
When either one of G-12 line keys on key matrix is touched, a corresponding signal
out of P30, P31, P32, P33, P34 will be input into P27. When no key is touched, the
signal is held at "L" level.
34 P26 IN Signal similar to P27.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into P26.
35 P25 IN Signal similar to P27.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into P25.
36 P24 IN Signal similar to P27.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into P24.
37-38 P23-P22 OUT Terminal not used.
39-40 P21-P20 OUT Segment data signals.
The relation between signals and indicators are as follows:
Signal Segment Signal Segment
P21,P20 .......... 1 P07,P06 .............6
P17.P16 .......... 2 P05,P04 .............7
P15,P14 .......... 3 P03,P02 .............8
P13,P12 .......... 4 P01,P00 .............9
P11,P10 .......... 5
41-48 P17-P10 OUT Segment data signal.
Signal similar to P21.
49-56 P07-P00 OUT Segment data signal.
Signal similar to P21.
57-59 P37-P35 OUT Terminal not used.
60 P34 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24
terminals while one of G4 line keys on key matrix is touched.
61 P33 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24
terminals while one of G5 line keys on key matrix is touched.
62 P32 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24
terminals while one of G6 line keys on key matrix is touched.
63 P31 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24
terminals while one of G7 line keys on key matrix is touched.
64 P30 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24
terminals while one of G8 line keys on key matrix is touched.
Pin No. Signal I/O Description
+5V
GND
ß(50Hz)
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General
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