Examples Of Lcd Driver Control Program - Epson E0C6001 Technical Manual

Examples of
LCD driver control
program
Fig. 3.5.4
Data set in A register and
displayed patterns
• Displaying 7-segment
The LCD display routine using the assignment of Figure
3.5.3 can be programmed as follows.
Label Mnemonic/operand
ORG
RETD
RETD
RETD
RETD
RETD
RETD
RETD
RETD
RETD
RETD
SEVENS: LD
LD
JPBA
When the above routine is called (by the CALL or CALZ
instruction) with any number from "0" to "9" set in the A
register for the assignment of Figure 3.5.4, seven segments
are displayed according to the contents of the A register.
A resister Display A resister
0 2
1 3
The RETD instruction can be used to write data to the
display memory only if it is addressed using the X register.
(Addressing using the Y register is invalid.)
Note that the stack pointer must be set to a proper value
before the CALL (CALZ) instruction is executed.
CHAPTER 3: PERIPHERAL CIRCUITS (LCD Driver)
Comment
000H
3FH ; 0 is displayed
06H ; 1 is displayed
5BH ;
2 is displayed
4FH ;
3 is displayed
66H ; 4 is displayed
6DH ; 5 is displayed
7DH ; 6 is displayed
27H ; 7 is displayed
7FH ; 8 is displayed
6FH ; 9 is displayed
B,0 ;
Set the address of jump
X,090H ;
Set address of display memory
Display A resister Display A resister
4
5
Display A resister Display
6 8
7 9
II-31