GENERAL DESCRIPTION
The ML64168 is a low power 4-bit microcontroller incorporating the Oki's original CPU core nX-4/30. The ML64168 provides a minimum instruction execution time of 4.3µs (@700kHz).
The ML64168 contains 8160-byte program memory, 512-nibble data memory, three 4-bit input-output ports, 4-bit input port, 4-bit output port, 2-channel RC oscillation type A/D converter, LCD driver for up to 120 segments, and buzzer output port. The ML64P168 is the one-time-programmable ROM version of ML64168, having one-time PROM(OTP) as internal program memory. The ML64P168 is used to evaluate the software development.

FEATURES
∙Processing speed
Minimum instruction execution time : 4.3 µs @700 kHz
                                                 91.6 µs @32.768 kHz
∙Clock generation circuit
              Low-speed clock : 32.768 kHz crystal oscillator
              High-speed clock : 700 kHz RC oscillator ( with an external resistor )
              CPU clock is selectable as Low-speed clock / High-speed clock by software.
∙Operating voltage : 1.5 V spec. / 3.0 V spec. ( selectable by mask option )
                           1.25 to 1.70 V (1.5 V spec.)
                           2.0 to 3.50 V (3.0 V spec.)
                           2.2  to 3.50 V (3.0 V spec., 1/2duty)
∙Operating temperature : - 40 to +85°C
∙Memory space
                     Internal program memory : 8160 bytes
                      Internal data memory : 512 nibbles
∙RC oscillation type A/D converter : 2 channels
                                               Time division 2-channel method