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38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
DESCRIPTION
The 38C8 group is the 8-bit microcomputer based on the 740 family
core technology.
The 38C8 group has a LCD drive control circuit (bias control, time
sharing control), a 10-bit A-D converter, and a Serial I/O as additional
functions.
The various microcomputers in the 38C8 group include variations of
internal memory type and packaging. For details, refer to the section
on part numbering.
FEATURES
●Basic machine-language instructions ....................................... 71
●The minimum instruction execution time ............................ 0.5 µs
(at 8 MHz oscillation frequency)
●Memory size
ROM ............................................................................ 60 K bytes
RAM ............................................................................ 2048 bytes
●Programmable input/output ports ............................................. 35
●Software pull-up resistors
.................................................................. Ports P0–P3, P41–P47
●Interrupts ................................................... 14 sources, 14 vectors
(includes key input interrupt)
●Timers ............................................................8-bit ✕ 3, 16-bit ✕ 2
●Serial I/O ........................ 8-bit ✕ 1 (UART or Clock-synchronized)
●A-D converter (32 kHz operating available) ... 10-bit ✕ 8 channels
●LCD drive control circuit
Bias ................................................................................... 1/5, 1/7
Duty .............................................................................. 1/16, 1/32
Common output ............................................................... 16 or 32
Segment output ............................................................... 52 or 68
●Main clock generating circuit (RC oscillation selectable)
...................... (connect to external ceramic resonator or resistor)
●Sub-clock generating circuit
............................... (connect to external quartz-crystal oscilaltor)
●Power source voltage
In high-speed mode .................................................... 4.0 to 5.5 V
In middle-speed mode ................................................ 2.2 to 5.5 V
In low-speed mode ..................................................... 2.2 to 5.5 V
●Power dissipation
In high-speed mode ........................................................... 30 mW
(at 8 MHz oscillation frequency, at 5 V power source voltage)
In low-speed mode .............................................................60 µW
(at 32 kHz oscillation frequency, at 3 V power source voltage, at
WIT state, at voltage multiplier operating, LCD drive waveform
generating state)
●Operating temperature range ................................... – 20 to 85°C
APPLICATIONS
Dot-matrix-type LCD displays
(73 pages)
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