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16.1 LCD Controller/Driver Functions
The functions of the LCD controller/driver incorporated in the µ PD780973 Subseries are shown below.
(1) Automatic output of segment signals and common signals is possible by automatic reading of the display data
memory.
(2) Display mode
• 1/4 duty (1/3 bias)
(3) Any of four frame frequencies can be selected in each display mode.
(4) Maximum of 20 segment signal outputs (S0 to S19); 4 common signal outputs (COM0 to COM3).
Fifteen of the segment signal outputs can be switched to input/output ports in units of 2 (P81/S19 to P87/S13,
P90/S12 to P97/S5).
The maximum number of displayable pixels is shown in Table 16-1.
Bias Method
Time Division
1/3
4
Note 10 digits on
type LCD panel with 2 segments/digit.
CHAPTER 16 LCD CONTROLLER/DRIVER
Table 16-1. Maximum Number of Display Pixels
Common Signals Used
COM0 to COM3
Maximum Number of Display Pixels
80 (20 segments × 4 commons)
Note
189
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