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SurePOS 100 Technical Reference
Page 79 of 104
USER CHARACTER DEFINITION (03h),<EXT>:
This command allows for custom character definition.
IBM Mode:
The byte following the command byte represents an address between 15h and 1Ah or between 1Ch
and 1Eh in the currently selected character set. The address byte is followed by 8 bytes that define the actual bit
patterns of the user defined character. The format of this data stream is as follows:
byte
#
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7
1 "x"h "x"h "x"h P1 P2 P3 P4 P5
2 "x"h "x"h "x"h P6 P7 P8 P9 P10
3 "x"h "x"h "x"h P11 P12 P13 P14 P15
4 "x"h "x"h "x"h P16 P17 P18 P19 P20
5 "x"h "x"h "x"h P21 P22 P23 P24 P25
6 "x"h "x"h "x"h P26 P27 P28 P29 P30
7 "x"h "x"h "x"h P31 P32 P33 P34 P35
8 * "x"h "x"h "x"h "x"h "x"h "x"h "x"h "x"h
* This is maintained for application compatibility with displays with 5x8 character boxes.
Px below represents a character pixel position in the character, a 1 indicating the pixel is ON, and 0 indicating the
pixel is OFF. In the table "x"h indicates that the bit value is a Don’t Care.
<--- 5 pixels wide ----->
P1 P2 P3 P4 P5 |
P6 P7 P8 P9 P10 |
P11 P12 P13 P14 P15 |
P16 P17 P18 P19 P20 7 pixels tall
P21 P22 P23 P24 P25 |
P26 P27 P28 P29 P30 |
P31 P32 P33 P34 P35 |
Logic Controls Emulation Mode:
The byte following the command byte contains the ASCII character (20h - 7Fh)
of a keyboard key to be redefined. This byte is followed by 5 bytes that define the bit patterns of the user defined
character. Logic Controls only allows one keyboard key to be redefined. This means there is only one user
definable character in this mode. Once a key is redefined, any occurrence of that character on the display will
change to the user defined character. If a new key is redefined the previously redefined key is restored to the
original character on all places on the display and the newly redefined key will be changed to the user definable
character. The format of this data stream is as follows: