The 38B5 group is the 8-bit microcomputer based on the 740 family core technology

• Basic machine-language instructions ………………………………… 71
• The minimum instruction execution time …………………….. 0.48 μs
(at 4.19 MHz oscillation frequency)
• Memory size
ROM ……………………………………… 24K to 60K bytes
RAM …………………………………… 1024 to 2048 bytes
• Programmable input/output ports ……………………………………… 55
• High-breakdown-voltage output ports ……………………………….. 36
• Software pull-up resistors ……. (Ports P5, P61 to P65, P7, P84 to P87, P9)
• Interrupts ………………………………………….. 21 sources, 16 vectors
• Timers ………………………………………………….. 8-bit 5 6, 16-bit 5 1
• Serial I/O1 (Clock-synchronized) …………………………….. 8-bit 5 1
…………………. (max. 256-byte automatic transfer function)

• Serial I/O2 (UART or Clock-synchronized) ……………….. 8-bit 5 1
• PWM …………………………………………………………………. 14-bit 5 1
8-bit 5 1 (also functions as timer 6)
• A-D converter ………………………………………. 10-bit 5 12 channels
• Fluorescent display function ……………………. Total 40 control pins
• Interrupt interval determination function ………………………………. 1
• Watchdog timer …………………………………………………… 20-bit 5 1
• Buzzer output ………………………………………………………………….. 1
• 2 Clock generating circuit
Main clock (XIN–XOUT) …………………….. Internal feedback resistor
Sub-clock (XCIN–XCOUT) ………. Without internal feedback resistor
(connect to external ceramic resonator or quartz-crystal
oscillator)
• Power source voltage
In high-speed mode …………………………………………… 4.0 to 5.5 V
(at 4.19 MHz oscillation frequency and high-speed selected)
In middle-speed mode ………………………………………… 2.7 to 5.5 V
(at 4.19 MHz oscillation frequency and middle-speed selected)
In low-speed mode …………………………………………….. 2.7 to 5.5 V
(at 32 kHz oscillation frequency)
• Power dissipation
In high-speed mode …………………………………………………. 35 mW
(at 4.19 MHz oscillation frequency)
In low-speed mode ……………………………………………………. 60 μW
(at 32 kHz oscillation frequency, at 3 V power source voltage)
• Operating temperature range …………………………….. –20 to 85 °C