19
R-763 -
DESCRIPTION OF LSI
LSI(IZA855DR)
The I/O signal of the LSI(IZA855DR) are detailed in the following table.
Pin No. Signal I/O Description
1-3 SEG21- OUT Terminal not used.
SEG23
4 COM1 OUT
Common data signal: COM1.
Connected to LCD (Pin No. 1)
5 COM2 OUT
Common data signal: COM2.
Connected to LCD (Pin No. 2)
6 COM3 OUT
Common data signal: COM1.
Connected to LCD (Pin No. 3)
7 COM4 OUT Terminal not used.
8 VLC IN
Signal synchronized with commercial power source frequency.
Signal similar to VSS.
9 VSS IN
Power source voltage: 0V.
VSS voltage of power source circuit input.
10 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.
11 XOUT OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
12-15 K00-K03 IN
Terminal to change functions according to the Model.
DC voltage in accordance with the Model in operation is applied to set up its function.
16 TEST IN Connected to VC.
17 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.
18 HOLD IN/OUT Connected to VDD.
19 INT2 IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
20 R81 IN Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into R81.
21 INT1 IN
Signal coming from encoder.
Signal similar to R81. Pulse signals are input into INT1.
22 R83 OUT Terminal not used.
23 R90 IN
To input signal which communicates the door open/close information to LSI.
Door open "L" level signal (0V). Door close "H" level (+5V)
24-25 R91-R92 OUT Terminal not used.
26 VDD IN Connected to GND.
27 R40 OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
20.0 msec
H : +5V
L : 0V
A
B
0.1 sec.
2 sec.
H : +5V
L: 0V
H : +5V
L: 0V
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