38C8

Features:

Basic machine-language instructions ....................................... 71
The minimum instruction execution time ............................ 0.5 s
                                                     (at 8 MHz oscillation frequency)
Memory size
 ROM ............................................................................ 60 K bytes
 RAM ............................................................................ 2048 bytes
Programmable input/output ports ............................................. 35
Software pull-up resistors
.................................................................. Ports P0P3, P41P47
Interrupts ................................................... 15 sources, 15 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 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 W
 (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


Application

Dot-matrix-type displays


Pinout




Specifications

Symbol	Parameter	Conditions	Ratings	Unit
VCC	Power source voltage	All voltages are based on Vss. Output transistors are cut off.	0.3 to 7.0	V
VI	Input voltage P00P07, P10P17, P20P27, P30P33, P40P47		0.3 to VCC+0.3	V
VI	nput voltage C1, C2		0.3 to 7.0	V
VI	Input voltage RESET, XIN, XCIN		0.3 to VCC+0.3	V
VI	Input voltage VLIN	When voltage multiplier is not operated.	0.3 to 7.0	V
VI	Input voltage VL1, VL2, VL3, VL4, VL5	VL1VL2VL3VL4VL5	0.3 to 7.0	V
VO	Output voltage P00P07, P10P17, P20P27, P30P33, P41P47		0.3 to VCC+0.3	V
VO	Output voltage C1, C2, C3		0.3 to 7.0	V
VO	Output voltage COM0COM31, SEG0SEG67		0.3 to VL5+0.3	V
VO	Output voltage XOUT, XCOUT		0.3 to VCC+0.3	V
Pd	Power dissipation	Ta = 25°C	300	mW
Topr	Operating temperature		20 to 85
Tstg	Storage temperature		40 to 125

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 size and packaging. For details, refer to the section on part numbering.