HD61830 Datasheet, PDF (11/43 Pages) Hitachi Semiconductor – LCDC (LCD Timing Controller)

HD61830/HD61830B
3. Set Number of Characters: (Execution time: 4 µs) H_N indicates the number of horizontal characters in
the character mode or the number of horizontal bytes in the graphic mode. If the total sum of horizontal
dots on the screen is taken as n,
n = H_p × H_N
H_N can be set to an even number from 2 to 128 (decimal).
Register
Instruction reg.
Number-of-characters reg.
R/W RS
0
1
0
0
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
1
0
0
(H_N – 1) binary
4. Set Number of Time Divisions (Inverse of Display Duty Ratio): (Execution time: 4 µs) N_X indicates
the number of time divisions in multiplex display.
1/N_X is the display duty ratio.
A value of 1 to 128 (decimal) can be set to N_X.
Register
R/W RS
Instruction reg.
0
1
Number-of-time-divisions reg. 0
0
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
1
1
0
(N_X – 1) binary
5. Set Cursor Position: (Execution time: 4 µs) C_p indicates the position in a character where the cursor is
displayed in the character mode. For example, in 5 × 7 dot font, the cursor is displayed under a character by
specifying C_p = 8 (decimal). The cursor horizontal length is equal to the horizontal character pitch H _p. A
value of 1 to 16 (decimal) can be set to C_p. If a smaller value than the vertical character pitch Vp is set (C_p
≤ Vp), and a character overlaps with the cursor, the cursor has higher priority of display (at cursor display
on). If C_p is greater than Vp, no cursor is displayed. The cursor horizontal length is equal to H_p.
Register
Instruction reg.
Cursor position reg.
R/W RS
0
1
0
0
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
1
0
0
0
0
0
0
(C_p – 1) binary
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