38B4

• Basic machine-language instructions ....................................... 71
• Minimum instruction execution time ................................. 0.48 µs
                                                    (at 4.2 MHz oscillation frequency)
• Memory size
                       ROM ............................................. 48K to 60K bytes
                       RAM ..........................................1024 to 2048 bytes
• Programmable input/output ports .......................................... 51
• 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

The 38B4 group is the 8-bit microcomputer based on the 740 family core technology.

The 38B4 group has six 8-bit timers, a 16-bit timer, a fluorescent display automatic display circuit, 12-channel 10-bit A D converter, a serial I/O with automatic transfer function, which are available for controlling musical instruments and household appliances.