The MSM6222B-xx is a dot matrix LCD controller which is fabricated in low power CMOS silicon gate technology. Character display on the dot matrix character type LCD can be controlled in combination with a 4-bit/8-bit microcontroller. This LSI consists of 16-dot COMMON driver, 40-dot SEGMENT driver, display data RAM, character generator RAM, character generator ROM and control circuit. The MSM6222B-xx is the equivalent of Hitachi's HD44780. There is, however, a slight difference between the two devices as described in the table on the last page. The MSM6222B-xx has the character generator ROM that can be programmed by custom mask. MSM6222B-01 is a standard version having 160 characters with lowercase (5 x 7 dots), and 32 characters with uppercase (5 x 10 dots) in this ROM.