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4.1.1 LOAD BUFFER POINTER
The buffer pointer control byte requires bits 7 to 4 to be set to 1010. This allows
any specific character within the display to be modified. The character to be
modified is represented by the value of bits 3 to 0. For a complete list of buffer
pointer values see the table below.
Control
Byte
AF A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE
Character
Controlled
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
For example, to point to character position number 7, a hex value of A5 is entered;
hence, the 8-bit byte would be:
1 0 1 0 0 1 0 1
Position data value.
Buffer pointer control command.
Control data byte identifier.
4.1.2 LOAD DIGIT COUNTER
The digit counter control byte requires bits 7 to 4 to be set to 1100. This is used
to define the number of character positions to be controlled. This byte is
normally used only during initialization routines. The binary value of the data
corresponding to bits 3 to 0 determines the actual number of characters to be
controlled. If less than 16 characters are used, a number corresponding to the
actual number of characters to be controlled should be entered.
For example, if six characters are to be controlled, a hex value of C6 is entered;
hence, the 8-bit byte would be:
1 1 0 0 0 1 1 0
Number of characters to be controlled.
Digit counter control command
Control data byte identifier.
4.1.3 LOAD DUTY CYCLE
The duty cycle control byte requires bits 7 to 5 to be set to 111. The value of the
data corresponding to the remaining bits determines the luminance level of the
display.
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