HD66108 Datasheet, PDF (21/60 Pages) Hitachi Semiconductor – (RAM-Provided 165-Channel LCD Driver for Liquid Crystal Dot Matrix Graphics)

HD66108
4. Selection for LCD Driving Circuit Configuration
4.1 Row Output Pin Selection
The HD66108T can assign a maximum of 65 pins for row outputs among the 165 pins named X0–X164.
The X0–X164 pins can be classified into four blocks labelled A, B, C, and D (Figure 11 (a)). Blocks A,
C, and D consist of row/column common pins and block B consists of column pins only. The output
function of the LCD driving pins and the combination of blocks can be selected by internal registers.
Figure 11 shows an example of 165-column-output mode. This configuration is useful when using more
than one HD66108T chip or using the HD66108T as a slave chip of the HD61203U.
Figure 12 shows an example of 65-row-output mode from the right side. Blocks A and B are used for
column output and blocks C and D (X100–X164 pins) for row output. This configuration offers an easy
way of connecting row output lines in the case of using one or more HD66108T chips.
Figure 13 shows an example of 65-row-output mode from the left and right sides. 32 pins of X0–X31 and
33 pins of X132–X164 are used for row output here. This configuration offers an easy way of connecting
row output lines in the case of using only one HD66108T chip.
Figure 14 shows an example of 33-row-output mode from the right side. Block D, i.e., X132–X164 pins,
is used for row outputs. This configuration provides a means for assigning many pins to column outputs
when 1/32 or 1/34 multiplexing duty ratio is desired.
In all modes, it is row data and multiplexing duty ratio that determine which pins are actually used
among the pins assigned to row output. Y values shown in Table 1 indicate the numbers of pins that are
actually used. Pins not used must be left disconnected.
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