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iC BLOCK
DIAGRAM
Function of terminals
LCD common
output
These are output terminals for commun signal to LCD.
'It is possible to display maximum
54 segment at matrix of S1 — S27.
Three levels of VDD, 1/2VDD and GND at 5ms intervals is output with 50Hz cycle from
P3—2
/A/D.IN
P3—A
/DC.
REF
SI
these terminals.
These are output terminals of segment signal.
LCD segment
output
It is possible to display maximum
54 segment of matrix of CCM1
and CCM2.
Key input
These are 4-bit input port for key matrix input,
port
All these terminals have pul! down resistor themselves.
Usually, T, ~ T, output ports are used for key return timing signal output.
Key timing
output port
These are output ports for 4-bit (Ty, ~ T,) and 3-bit (T, ~ T,).
Usually, these are used for key return timing signal output of key matrix.
1/O port
3 A—D|
These are I/O ports of 2-bit.
/analogue
The
port can
designate
output and input at every
1 bit and the designation can be
voltage input
| made depend on contents of inner port called PORT-3 I/O CONTROL.
/standard
| Also, these terminals are used for analogue input of built-in 4-bit A/D converter.
voltage input
| Change
contro!
to A/D converter input is made depend on contents of PORT-3
1/O
CONTROL
port.
Built-in A/D converter is controlled by program of random compara-
tion system, P3-1 is for standard voltage input and P3-2 is for analogue comparate input.
1/0 port-2
These terminals are 4-bit 1/O ports.
The port can designate the output and input at every 1 bit and designation can be made
depend on contents of inner port called PORT-2 1/O CONTROL.
Muting signal
output port
This terminal is for 1 bit output port and usually used for muting control signal output,
Note:
When
INH
input is changing
"HH" to "L"
or "L"
to "H"
alternately, output
will automatically be set to ''H"' level.
These terminals are for serial interface.
It can control an external PLL LSI or optional IC by SIO command.
Serial transmission mode of NCD/NCD can be selected by the program.
Strobing pulse
output
Serial clock
output
Serial data
output
. Serial data
input
Reference
Frequency
Signal output
This is output terminal for standard frequency signal to PLL LSI. Eight kind of 1kHz,
5kHz, 9kHz, 10kHz, 12.5kKHz, 25kHz, 50kHz and 100kHz standard frequency signal can
be selected by the program.
Note:
When INH is in ''L" level, output is automatically fixed to 'L" level.
This is input terminal for system reset signal of device.
When INT is in "L" level, device will be reset.
When
INT are ''H" level, program starts from "O""
This terminal
is used in H"
level setting because usually, when OV > 4.5V voltage is
applied to Vpp, device will be reset (power on reset).
Note:
After system reset, 1/O port is set to input mode. but output port-is instable,
therefore, initialize the program depend on condition if needed.
Initialize input
——
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