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R-21HT
R-21HV
Pin No.
Signal
I/O
22-24
P44-P42
OUT
25
INT1
IN
26
P40
IN
27
RESET
IN
28
P71
OUT
29
P70
IN/OUT
30
XIN
IN
31
XOUT
OUT
32
VSS
IN
33
P27
IN
34
P26
IN
35
P25
IN
36
P24
IN
37-38
P23-P22
OUT
39-40
P21-P20
OUT
41-48
P17-P10
OUT
49-56
P07-P00
OUT
57-59
P37-P35
OUT
60
P34
OUT
Digit selection signal.
Signal similar to P45.
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
Connected to GND through resistor.
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.
Memory (EEPROM) clock output.
Memory (EEPROM) data input/output.
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.
Connected to GND.
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.
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.
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.
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
Signal
P21,P20 .......... 1
P05,P04 .........7
P17.P16 .......... 2
P03,P02 .........8
P15,P14 .......... 3
P01,P00 .........9
P13,P12 .......... 4
P11,P10 .......... 5
P07,P06 .......... 6
Segment data signal.
Signal similar to P21.
Segment data signal.
Signal similar to P21.
Terminal not used.
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.
20
Description
Segment
ß(60Hz)
H : +5V
L : GND
16.7 msec
+5V
GND
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