Character data writing device

Claim 1

A character data writing device comprising: a latch pulse generating section for generating clock pulses and a latch pulse; a display data holding circuit for holding character data, and serially outputting said character data; a display data switching circuit for inputting the character data outputted from said display data holding circuit into said display data holding circuit again and for receiving a switching command of display data, thereby switching character data outputted from said display data holding circuit to new character data to be inputted to said display data holding circuit; a display data latching circuit for latching character data outputted from said display data holding circuit in synchronism with the latch pulse and for supplying the latched character data to a character data display section; a modulo N counter for counting a number of clock pulses generated by said latch pulse generating section and for generating a reset pulse every time a count of N clock pulses is ended, and said modulo N counter receiving a forced reset signal, and also generating a reset pulse upon receiving said forced reset signal, said latch pulse generating section generating said latch pulse upon each generation of said reset pulse by said modulo N counter; and a control section for supplying the switching command of said display data to said display data switching circuit, and for supplying the forced reset signal to said modulo N counter at the same time, whereby a latch pulse is immediately generated and character data is immediately latched in said display data latching circuit.