ROHM RCM2010R handbook
Datasheet
The RCM2010R is a 20-character 2-line liquid crystal module produced by Panasonic. It has a 5 x 7 dot matrix liquid crystal display and can display up to 226 characters and special symbols. It uses a 4-bit or 8-bit MPU interface and supports clear display, cursor on/off, and character blinking.