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Description

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

1  Basic machine-language instructions : 71

2. Minimum instruction execution time : 0.48 µs (at 4 2 MHz oscillation frequency)

3. Memory size

   (1) ROM : 48K to 60K bytes

   (2) RAM : 1024 to 2048 bytes

4. Programmable input/output ports : 51

5. High-breakdown-voltage output ports : 36

6. Interrupts : 21 sources, 16 vectors

7. Timers : 8-bit x 6, 16-bit x 1

8. Serial I/O1 (Clock-synchronized) : 8-bit x 1z  (max  256-byte automatic transfer function)

9. Serial I/O2 (UART or Clock-synchronized) : 8-bit x 1

10. PWM : 14-bit x 1,  8-bit x 1 (also functions as timer 6)

11. A-D converter : 10-bit ✕12 channels

12. Fluorescent display function : Total 40 control pins

13. Interrupt interval determination function : 1 

14. Watchdog timer : 20-bit x 1