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R-23GT-F
R-24GT-F
Pin No.
Signal
21
P45
OUT
22-24
P44-P42
OUT
25
INT1
26
INT0
27
RESET
28
P71
29
P70
IN/OUT
30
XIN
31
XOUT
OUT
32
VSS
33
P27
34
P26
35
P25
36
P24
37-38
P23-P22
OUT
39-40
P21-P20
OUT
I/O
Digit selection signal.
The relation between digit signal and digit are as
follows:
Digit signal Digit
P42 ..................... 1st.
P43 .................... 2nd.
P44 ..................... 3rd.
P45 ..................... 4th.
Normally, one pulse is output in every ß period,
and input to the grid of the light-emitting diode.
Digit selection signal.
Signal similar to P45.
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
IN
Connected to GND through resistor.
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.
OUT
Memory (EEPROM) clock output.
Memory (EEPROM) data input/output.
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.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
IN
Connected to GND.
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.
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.
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.
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.
Terminal not used.
Segment data signals.
The relation between signals and indicators are as follows:
Signal
Segment
P21,P20 .......... 1
P17.P16 .......... 2
P15,P14 .......... 3
P13,P12 .......... 4
P11,P10 .......... 5
P07,P06 .......... 6
Description
ß(60Hz)
P42
P43
P44
P45
Signal
Segment
P05,P04 ............. 7
P03,P02 ............. 8
ß(60Hz)
P01,P00 ............. 9
24
H
L
+5V
GND
H : +5V
L : GND
16.7 msec
+5V
GND
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