hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 43

• Manufacturer Part Number: hd66712u
• Description: Dot-matrix Liquid Crystal Display Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66712U
B: The character indicated by the cursor blinks when B is 1. The blinking is displayed as switching
between all blank dots and displayed characters at a speed of 370-ms intervals when f
The cursor and blinking can be set to display simultaneously. (The blinking frequency changes according
to f
Extended Function Set
When the extended register enable bit (RE) is 1, FW, B/W, and NW bit shown below are accessed.
Once these registers are accessed, the set values are held even if the RE bit is set to zero.
FW: When FW is 1, each displayed character is controlled with a 6-dot width. The user font in CGRAM
is displayed with a 6-bit character width from bits 5 to 0. As for fonts stored in CGROM, no display area
is assigned to the left most bit, and the font is displayed with a 5-bit character width. If the FW bit is
changed, data in DDRAM and CGRAM SEGRAM is destroyed. Therefore, set FW before data is written
to RAM. When font width is set to 6 dots, the frame frequency decreases to 5/6 compared to 5-dot time.
See “Oscillator Circuit” for details.
B/W: When B/W is 1, the character at the cursor position is cyclically displayed with black-white
inversion. At this time, bits C and B in display on/off control register are “Don’t care.” When f
270 kHz, display is changed by switching every 370 ms.
NW: When NW is 1, 4-line display is performed. At this time, bit N in the function set register is “Don’t
care.”
406
OSC
or the reciprocal of f
cp
. For example, when f
i) Cursor display example
Figure 16 Example of Display Control
i) 5-dot character width
a) Cursor blink width control
iii)
b) Font width control
White-black inverting
display example
cp
Alternating
display
is 300 kHz, 370
ii) Blink display example
ii) 6-dot character width
Alternating
display
270/300 = 333 ms.)
cp
or f
OSC
is 270 kHz.
CP
or f
OSC
is