GENERAL DESCRIPTION
The ML63187B and ML63189B are CMOS 4-bit microcontroller with built-in 1024-dot matrix LCD drivers and operates at 0.9 V (min.). The ML63187B and 63189B are suitable for applications such as games, toys, watches, etc. which are provided with an LCD display.
The ML63187B and ML63189B are M6318x series mask ROM-version product of OLMS-63K family, which employs Oki’s original CPU core nX-4/250.

FEATURES
• Rich instruction set
   408 instructions
   Transfer, rotate, increment/decrement, arithmetic operations, comparison, logic operations, mask
   operations, bit operations, ROM table reference, stack operations, flag operations, branch, conditional
   branch, call/return, control

• Rich selection of addressing modes
   Indirect addressing of four data memory types, with current bank register, extra bank register, HL register
   and XY register
   Data memory bank internal direct addressing mode
• Processing speed
   Two clocks per machine cycle, with most instructions executed in one machine cycle
   Minimum instruction execution time : 61 µs (@32.768 kHz system clock)
                                         1 µs (@2 MHz system clock)
• Clock generation circuit
   Low-speed clock : Crystal oscillation or RC oscillation selected with mask option (30 to 80 kHz)
   High-speed clock : Ceramic oscillation or RC oscillation selected with software (2 MHz max.)

• Program memory space
   • ML63187B : 16 K words
   • ML63189B : 32 K words
   Basic instruction length is 16 bits/1 word
• Data memory space
   • ML63187B : 1024 nibbles
   • ML63189B : 1536 nibbles
• Stack level
   Call stack level : 16 levels
   Register stack level : 16 levels

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