PF955-02
S1C88408
8-bit Single Chip Microcomputer
ꢀ Original Architecture Core CPU
ꢀ Low Current Consumption
ꢀ Wide-range Operating Voltage (1.8V to 5.5V)
ꢀ High Speed Operation in Low Voltage
ꢀ A/D Converter
ꢀ DESCRIPTION
The S1C88408 is a single chip microcomputer which consists of a CMOS 8-bit core CPU S1C88 (MODEL3),
8KB ROM, 3.75KB RAM, dot-matrix LCD controller, 3 types of timers/counters, serial interface (IR input/output
function is available). The S1C88408 operates faster even with low supply voltage, and is most suitable for
various application equipment such as information terminals needing low power operation. Furthermore, the
S1C88408 can control up to 4M × 3 bytes of memory with the 22-bit outside address bus and 3-bit chip enable
signals, therefore it can also be applied to systems such as electronic dictionaries and organizers.
ꢀ FEATURES
ꢀꢀCore CPU..............................................CMOS 8-bit core CPU S1C88 (MODEL3)
ꢀꢀOSC1 oscillation circuit.........................Crystal oscillation circuit/CR oscillation circuit/external clock input
32.768 kHz (Typ.)
ꢀꢀOSC3 oscillation circuit.........................Crystal oscillation circuit/ceramic oscillation circuit/CR oscillation
circuit/external clock input 8 MHz (Max.)
ꢀꢀInstruction set........................................Basic instruction: 54 types, Total: 608 types (multiplication/division
instructions are usable)
Addressing mode: 12 types
ꢀꢀMin. instruction execution time .............0.25 µsec/8 MHz (2 clocks)
ꢀꢀInternal ROM capacity ..........................8K bytes
ꢀꢀInternal RAM capacity...........................3.75K bytes (display memory is included; data/display memory
size can be set by mask option)
ꢀꢀBus line .................................................Address bus: 22bits
Data bus:
CE signal:
8bits
3bits
(usable as general output port or I/O port
when it is not used as a bus signal)
WR signal: 1bit
RD signal: 1bit
ꢀꢀInput port ...............................................12 bits
• 2 bits are usable for event counter input
ꢀꢀOutput port ............................................30 bits
• They are used as address bus and bus control signals when
external bus is set
• Usable for clock output and buzzer output
ꢀꢀI/O port ..................................................28 bits
• 8 bits are used as data bus when external bus is set
• Usable for serial interface input/output
ꢀꢀSerial interface ......................................1 channel
• Clock synchronous mode/asynchronous mode selectable
• Usable as IrDA interface
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