HT0313A Tomato LSI, Inc., HT0313A Datasheet - Page 20

• Manufacturer Part Number: HT0313A
• Description: 65COM/132SEG DRIVER & CONTROLLER FOR STN LCD
• Manufacturer: Tomato LSI, Inc.

HT0313A
TOMATO LSI Inc.
d. Line address circuit
This circuit assigns DDRAM a line address corresponding to the first line (COM0) of the display. Using the
display start line address set command, what is normally the top line of the display can be specified.
By setting the line address repeatedly, it is possible to realize the screen scrolling and page switching
without changing the contents of DDRAM as shown in figure 6-6.
At the beginning of each LCD frame, the contents of register are copied to the line counter which is
increased by +1 and the line address is generated for transferring the 132-bit RAM data to the display
data latch circuit. However, the display data of icons is not scrolled because the MPU can not access the
line address of icons.
e. Segment control circuit
This circuit controls the display data by the Display ON / OFF, reverse display ON / OFF and entire
display ON /OFF instructions without changing the data in the DDRAM.
Column address[Y7:Y0]
LCD panel display
LCD panel display
SEG OUTPUT
Display data
(ADC = 0)
(ADC = 1)
Figure 6-5. The relationship between the column address and the segment outputs
65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
SEG0
00H
1
20
SEG1
01H
0
SEG2
02H
1
SEG4
04H
1
………
………
SEG128
80H
0
SEG129
81H
1
Ver 0.0
SEG130
82H
0
SEG131
83H
1