HD66108T00 HITACHI [Hitachi Semiconductor], HD66108T00 Datasheet - Page 12

• Manufacturer Part Number: HD66108T00
• Description: (RAM-Provided 165-Channel LCD Driver for Liquid Crystal Dot Matrix Graphics)
• Manufacturer: HITACHI [Hitachi Semiconductor]

Functional Description
1. Display Size Programming
A variety of display sizes can be programmed by changing the system configuration and internal register
settings.
(1) System Configuration Using One HD66108T Chip
When the 33-row-output mode is selected by internal register settings, a maximum of 132 dots in the X
direction can be displayed (Figure 3 (b)).
Table 1 shows the relationship between display sizes and the control register’s (FCR) ROS and DUTY
bits. ROS and DUTY bit settings determine the function of X pins. For more details, refer to “4.1 Row
Output Pin Selection.”
(2) System Configuration Using One HD66108T Chip and One HD61203 Chip as Row Driver
(3) System Configuration Using Two or more HD66108T Chips
Table 1
ROS Bit Setting
(X0–X164 Pin Function)
165-column-output
65-row-output from the right side X: 100
65-row-output from the left and
right sides
33-row-output from the right side X: 132
When the 65-row-output mode is selected by internal register settings, a maximum of 100 dots in the
X direction can be displayed (Figure 3 (a)). Display size in the Y direction can be selected from 32,
34, 36, 48, 50, 64, and 65 dots according to display duty setting. Note that Y direction settings does
not affect those in the X direction (100 dots).
A maximum of 64 dots in the Y direction and 165 dots in the X direction can be displayed. 48 or 64
dots in the Y direction can be selected by HD61203 pin settings (Figure 3 (c)).
X direction size can be expanded by 165 dots per chip. Figure 3 (d) shows a 265
direction size can be expanded up to 130 dots with 2 chips; a 100 130-dot display provided by 2
chips is shown in Figure 3 (e).
Relationship between Display Size and Register Settings (No. of Dots)
1/32
Specified by a row driver
Y: 32
X: 100
Y: 32
Y: 32
1/34
X: 100
Y: 34
X: 100
Y: 34
X: 132
Y: 33
Duty Bit Setting (Multiplexing Duty Ratio)
1/36
X:100
Y: 36
X:100
Y: 36
X: 132
Y: 33
1/48
X: 100
Y: 48
X: 100
Y: 48
X: 132
Y: 33
1/50
X: 100
Y: 50
X: 100
Y: 50
X: 132
Y: 33
65-dot display. Y
1/64
X: 100
Y: 64
X: 100
Y: 64
X: 132
Y: 33
HD66108
1/66
X:100
Y: 65
X:100
Y: 65
X: 132
Y: 33
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