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. FEATURES * 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, P61to P65, P7, P84to P87,P9) * Interrupts ...... 21 sources, 16 vectors * Timers ............... 8-bit ✕ 6, 16-bit ✕ 1 * Serial I/O1 (Clock-synchronized) ............. 8-bit ✕ 1z (max. 256-byte automatic transfer function) * Serial I/O2 (UART or Clock-synchronized) ......... 8-bit ✕ 1 * PWM .......... 14-bit ✕ 1, 8-bit ✕ 1 (also functions as timer 6) * A-D converter ............. 10-bit ✕12 channels * Fluorescent display function ... Total 40 control pins * Interrupt interval determination function .... 1 * Watchdog timer ..... 20-bit ✕1
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