UPD754304A

 Low-voltage operation: VDD = 1.8 to 5.5 V
 Internal memory
     Program memory (ROM):
        PD754302, 754302(A))
           2048 ×8 bits (UPD754304, 754304(A))
           4096 ×8 bits (Data memory (RAM): 256 ×4 bits
 Variable instruction execution time effective for high-
 speed operation and power saving
       0.95, 1.91, 3.81, or 15.3 _Us (at 4.19 MHz)
       0.67, 1.33, 2.67, or 10.7 _Us (at 6.0   MHz)
 Internal serial interface (1 channel)
 Powerful timer function (3 channels)
 Inherits instruction set of existing 75X Series for easy replacement