A picture frame generating circuit has: a coordinate value calculation
processor that calculates frame start position (X, Y), picture end
position (X, Y), frame end position (X, Y) using calculation start signal
as activation signal, based on picture position (X, Y) registers, picture
size (X, Y) registers and frame size register which are written through a
data bus, the processor allowing frame color data to be written into frame
color register to designate the color of frame through the data bus: and a
selection circuit of frame and picture to which the frame start position
(X, Y), picture end position (X, Y), frame end position (X, Y), picture
position (X, Y) registers, frame color data, picture data, horizontal
display position and vertical display position are input, the circuit
selecting the picture data or frame color data and outputs the selected
one as display data.
