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DESCRIPTION

The 3851 group is the 8-bit microcomputer based on the 740 family core technology.

The 3851 group is designed for the household products and office automation equipment and includes serial I/O functions, 8-bit timer, A-D converter, and I2C-bus interface.

FEATURES

● Basic machine-language instructions ...................................... 71

● Minimum instruction execution time .................................. 0.5 μs

(at 8 MHz oscillation frequency)

● Memory size

ROM ............................................................................. 16 Kbytes

RAM .............................................................................. 512 bytes

● Programmable input/output ports ............................................ 34

● Interrupts ................................................. 16 sources, 16 vectors

● Timers ............................................................................. 8-bit ? 4

● Serial I/O ....................... 8-bit ? 1(UART or Clock-synchronized)

● Multi-master I2C-bus interface (option) ....................... 1 channel

● PWM ............................................................................... 8-bit ? 1

● A-D converter ............................................... 10-bit ? 5 channels

● Watchdog timer ............................................................ 16-bit ? 1

● Clock generating circuit ..................................... Built-in 2 circuits

(connect to external ceramic resonator or quartz-crystal oscillator)

● Power source voltage

In high-speed mode .................................................. 4.0 to 5.5 V

(at 8 MHz oscillation frequency)

In high-speed mode .................................................. 2.7 to 5.5 V

(at 4 MHz oscillation frequency)

In middle-speed mode ............................................... 2.7 to 5.5 V

(at 8 MHz oscillation frequency)

In low-speed mode .................................................... 2.7 to 5.5 V

(at 32 kHz oscillation frequency)

● Power dissipation

In high-speed mode ..........................................................34 mW

(at 8 MHz oscillation frequency, at 5 V power source voltage)

In low-speed mode ............................................................ 60 μW

(at 32 kHz oscillation frequency, at 3 V power source voltage)

● Operating temperature range.................................... –20 to 85°C

APPLICATION

Office automation equipment, FA equipment, Household products, Consumer electronics, etc.