PD17012_15 Datasheet, PDF (96/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
10.6.6 Configuration and function of LCD mode select register
The LCD mode select register specifies whether the PYA pins are used as LCD segment signal output pins or as
general-purpose port pins. This register also turns ON/OFF all the LCD displays, and outputs key source signals.
The configuration and function of this register are illustrated below.
Name
LCD mode select
register
Flag symbol Address
b3 b2 b1 b0
0 K L P 10H
S CY
E DA
N ES
NE
L
Read/
Write
R/W
Selects LCD segment output pin or general-purpose output pin
0 Uses LCD0/KS0/PYA0 to LCD15/KS15/PYA15 pins as LCD segment pins
1 Uses LCD0/KS0/PYA0 to LCD15/KS15/PYA15 pins as general-purpose output port pins
Turns on/off all LCD displays
0
Display off (all segment output and common output pins go low)
1
Display on
Sets output of key source signal
0
Key source off
1
Key source on
Fixed to 0
Power-on
Clock stop
CE
0000
000
Retained
The 16 pins, LCD0/KS0/PYA0 to LCD15/KS15/PYA15, function alternately as LCD segment signal outputs and key
source signal outputs. When any of these pins is set as a general-purpose output port pin, however, neither the LCD
segment signal nor key source signal is output.
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Data Sheet U10101EJ4V0DS