HD61830 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics
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HD61830 Datasheet PDF : 43 Pages
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HD61830/HD61830B
3. Set Number of Characters: (Execution time: 4 µs) HN 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 = Hp × HN
HN 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
(HN – 1) binary
4. Set Number of Time Divisions (Inverse of Display Duty Ratio): (Execution time: 4 µs) NX indicates
the number of time divisions in multiplex display.
1/NX is the display duty ratio.
A value of 1 to 128 (decimal) can be set to NX.
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
(NX – 1) binary
5. Set Cursor Position: (Execution time: 4 µs) Cp 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 Cp = 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 Cp. If a smaller value than the vertical character pitch Vp is set (Cp
≤ Vp), and a character overlaps with the cursor, the cursor has higher priority of display (at cursor display
on). If Cp is greater than Vp, no cursor is displayed. The cursor horizontal length is equal to Hp.
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
(Cp – 1) binary
11
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