GENERAL DESCRIPTION
The 3885 group is the 8-bit microcomputer based on the 740 family core technology.
The 3885 group is designed for Keyboard Controller for the note book PC.
The multi-master I2C-bus interface can be added by option.

FEATURES
<Microcomputer mode>
● Basic machine-language instructions ...................................... 71
● Minimum instruction execution time .................................. 0.5 µs
   (at 8 MHz oscillation frequency)
● Memory size
   ROM ................................................................. 32K to 60K bytes
   RAM ............................................................... 1024 to 2048 bytes
● Programmable input/output ports ............................................ 72
● Software pull-up transistors ....................................................... 8
● Interrupts ................................................. 22 sources, 16 vectors
● Timers ............................................................................. 8-bit ✕ 4
● Watchdog timer ............................................................ 16-bit ✕ 1
● PWM output .................................................................. 14-bit ✕ 2
● Serial I/O....................... 8-bit ✕ 1(UART or Clock-synchronized)
● Multi-master I2C bus interface (option) ........................ 1 channel
● LPC interface .............................................................. 2 channels
● Serialized IRQ .................................................................. 3 factor
● A-D converter ............................................... 10-bit ✕ 8 channels
● D-A converter ................................................. 8-bit ✕ 2 channels
● Comparator circuit ...................................................... 8 channels
● Clock generating circuit ..................................... Built-in 2 circuits
   (connect to external ceramic resonator or quartz-crystal oscillator)
● Power source voltage ................................................ 3.0 to 3.6 V
● Power dissipation
   In high-speed mode ..........................................................20 mW
   (at 8 MHz oscillation frequency, at 3.3 V power source voltage)
   In low-speed mode ......................................................... 330 mW
   (at 32 kHz oscillation frequency, at 3.3 V power source voltage)
● Operating temperature range.................................... –20 to 85°C

<Flash memory mode>
● Supply voltage ................................................. VCC = 3.3 ± 0.3V
● Program/Erase voltage ................................. VPP = 5.0 V ± 10 %
● Programming method ...................... Programming in unit of byte
● Erasing method
   Parallel I/O mode
   CPU reprogramming mode
● Program/Erase control by software command
● Number of times for programming/erasing ............................ 100
● Operating temperature range (at programming/erasing)
   ........................................................................Room temperature