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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

¡ñ Basic machine-language instructions ...................................... 71

¡ñ Minimum instruction execution time .................................. 0.5 ?s

(at 8 MHz oscillation frequency)

¡ñ Memory size

ROM ................................................................. 32K to 60K bytes

RAM ............................................................... 1024 to 2048 bytes

¡ñ Programmable input/output ports ............................................ 72

¡ñ Software pull-up transistors ....................................................... 8

¡ñ Interrupts ................................................. 22 sources, 16 vectors

¡ñ Timers ............................................................................. 8-bit ? 4

¡ñ Watchdog timer ............................................................ 16-bit ? 1

¡ñ PWM output .................................................................. 14-bit ? 2

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

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

¡ñ LPC interface .............................................................. 2 channels

¡ñ Serialized IRQ .................................................................. 3 factor

¡ñ A-D converter ............................................... 10-bit ? 8 channels

¡ñ D-A converter ................................................. 8-bit ? 2 channels

¡ñ Comparator circuit ...................................................... 8 channels

¡ñ Clock generating circuit ..................................... Built-in 2 circuits

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

¡ñ Power source voltage ................................................ 3.0 to 3.6 V

¡ñ 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)

¡ñ Operating temperature range.................................... ¨C20 to 85¡ãC

¡ñ Supply voltage ................................................. VCC = 3.3 ¡À 0.3V

¡ñ Program/Erase voltage ................................. VPP = 5.0 V ¡À 10

¡ñ Programming method ...................... Programming in unit of byte

¡ñ Erasing method

Parallel I/O mode

CPU reprogramming mode

¡ñ Program/Erase control by software command

¡ñ Number of times for programming/erasing ............................ 100

¡ñ Operating temperature range (at programming/erasing)

........................................................................Room temperature