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| LC7982A Datasheet, PDF (12/18 Pages) Sanyo Semicon Device – LCD Dot Matrix Graphics Display Controller | |||
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LC7982A
⢠Busy flag readout
Register
R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Busy flag
1 1 1/0
*
When the LC7982A is set to readout mode when RS is 1, the state of the busy flag will be output from DB7. The busy
flag will be 1 during the execution of any of the above thirteen instructions, and will be 0 when instruction execution
has completed and the LC7982A can accept the next instruction. When the busy flag is 1, the LC7982A cannot accept
instructions. Therefore, applications must check the busy flag and verify that it is 0 before executing an instruction or
writing data to the LC7982A. However, after a data read instruction or a data write instruction, the microcontroller
may execute the next instruction without checking the busy flag after the maximum value of the read cycle or write
cycle, respectively. The busy flag is not changed by writes to the instruction register when RS is 1. Therefore, it is not
necessary to check the busy flag immediately after writing the instruction register.
It is not necessary to issue any instruction register commands to read out the busy flag.
Relationship between HP, HN, VP, CP, and NX and the LCD Panel
HN (Character positions)
Symbol
Function
Description
Value
HP
Horizontal character pitch
Character pitch in the horizontal direction
6 to 8 dots
HN
Horizontal characters
Number of characters per line in the horizontal direction or number of words per line An even number
(in graphics mode)
in the range 2 to 256
VP
Vertical character pitch
Character pitch in the vertical direction
1 to 16 dots
CP
Cursor position
Number of the line where the cursor will be displayed
1 to 16 lines
NX
Vertical lines
Display duty
1 to 256 lines
Note: If m is the number of dots in the vertical direction on the screen, and n is the number of dots in the horizontal direction, then the following relationships
will be held:
1/m = 1/NX = Display duty
n = HP Ã HN
m/VP = Number of lines displayed
CP ⤠VP
No. 5946-12/18
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