3820

*Basic machine-language instructions............................................ 71
*The minimum instruction execution time ................................. 0.5 s
                                                            (at 8MHz oscillation frequency)
*Memory size
  ROM .................................................................. .....4 K to 32 K bytes
  RAM ..................................................................... 192 to 1024 bytes
*Programmable input/output ports ................................................ 43
*Software pull-up/pull-down resistors (Ports P0-P7 except Port P40 )
*Interrupts ..................................................... 16 sources, 16 vectors
  (includes key input interrupt)
*Timers ....................................................................8-bit   3, 16-bit  2
*Serial I/O1 ..............................8-bit   1 (UART or Clock-synchronized)
*Serial I/O2 ...........................................8-bit   1 (Clock-synchronized)

The 3820 group is the 8-bit microcomputer based on the 740 fam-ily core technology.

The 3820 group has the LCD drive control circuit and the serial I/O as additional functions.

The various microcomputers in the 3820 group include variationsof internal memory size and packaging. For details, refer to the section on part numbering.

For details on availability of microcomputers in the 3820 group, re-fer to the section on group expansion.