User’s Manual U18438EJ2V0UD
16
CHAPTER 3 LCD CONTROLLER/DRIVER
3.1 Functions of LCD Controller/Driver
The functions of the LCD controller/driver in the
µ
PD71312 are as follows.
(1) The LCD driver reference voltage generator can switch internal voltage boosting, external resistance division,
and internal resistance division.
(2) Automatic output of segment and common signals based on automatic display data memory read
(3) Five different display modes:
• Static
• 1/2 duty (1/2 bias)
• 1/3 duty (1/2 bias)
• 1/3 duty (1/3 bias)
• 1/4 duty (1/3 bias)
(4) Four different frame frequencies, selectable in each display mode
(5) Segment signal outputs: 36 (S0 to S35) (52-pin product),
40 (S0 to S39) (64-pin product)
Common signal outputs: 4 (COM0 to COM3)