19
R-733 -
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
