Toshiba B-EP Series Interface Specification page 355

[TOPIX compression mode]
Graphic data
Length L1
L2
L3
(1) Length: Total number of bytes of the graphic data (0001H ~ )
Ex. Length = 20 bytes:
(2) L1 parameter: Shows in which large block (512 dots/block) the changed data is contained.
7
L1
512 dots
(3) L2 parameter: Shows in which medium block (64 dots/block) the changed data is contained
7
L2
64 dots
(4) L3 parameter: Shows in which small block (8 dots/block) the changed data is contained (of
7
L3
8 dots
* The graphic width for only the smaller value of either the designated value or the max. buffer
size (512 KB) is drawn.
The minimum unit of the data drawing is 8 dots (1 byte). If the graphic width is set to 3 dots, it
is reset to 8 dots (1 byte).
First line
0 0
6 5 4 3 2 1 0
512 dots 512 dots
(of the L1 large block).
6 5 4 3 2 1 0
64 dots 64 dots
the L2 medium block).
6 5 4 3 2 1 0
8 dots 8 dots
Exclusive-OR is carried out between the current image data and the
image data one line previous. Only the changed bit is set to ON (1).
The alignment of dots is MSB (left dots) and LSB (right dots).
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CHAPTER 5 TPCL-LE MODE (INTERFACE COMMANDS)
Range for length
L1
1 4
0: Not present
1: Present
0: Not present
1: Present
0: Not present
1: Present
B-EP Series
Second line