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2-3. CKDC.il (HD404708) Description
1) Outline
The LSI is a 4bit microprocessor developed for the use in the ER-
1921/2396. It controls real time clock, key and display. Its basic
functions are described below:
KEY:
Controls max. 253 momentary keys.
(Sharp 2-key roll over conirol)
Simultaneous read of key and switch is possible.
(When key is read, the states of mode, clerk, switch are
also buffered. The host can read key and key data
simultaneously.
Switch:
Mode switch up to 14 positions.
8 bit clerk (casher) switch
2 bit feed switch
1 bit receipt on/off switch
1 bit option switch
4 bit general purpose switch (1 bit is used for key board
selection.)
Display: 16 digit dot display
12 digit, 7-sagment display (Display digit can be selected).
Decimal point of dot, 7-segment display, indicator
7 segment programmable pattem: 4 patterns
7 segment display driver included.
Buzzer: One tone control
Clock:
Year, Month, Day, Day, of week, o/clock, minute
Alarm:
O'clock, minute
Interrupt request (event control):
Key input, switch state change, alarm generation, counter
overflow detection are available.
2) System diagrant
7SEG-DISPLAY
SDIG
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