PD17012_15 Datasheet, PDF (216/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
19. LCD CONTROLLER/DRIVER
The LCD (Liquid Crystal Display) controller/driver can display an LCD of up to 60 dots by outputting segment
and common signals in combination.
19.1 Configuration of LCD Controller/Driver
Figure 19-1 shows the block diagram of the LCD controller/driver.
As shown in the figure, the LCD controller/driver consists of a common signal output timing control block,
segment signal/key source signal output timing control block, segment signal/general-purpose output port select
block, LCD segment register, and key source data register/port YA group register.
The following section 19.2 outlines the function of each block.
Figure 19-1. Outline of LCD Controller/Driver
COM2
COM1
COM0
Common
signal output
timing
LCDEN flag
KSEN flag
LCD19/P2H0
LCD18/P2G0
LCD17/P2F0
LCD16/P2E0
LCD15/KS15/PYA15
LCD0/KS0/PYA0
Segment signal/
general-purpose
output port
select block
Segment signal/
key source
signal output
timing control
block
LCD segment resister
(data memory space)
Key source data register/
port YA group register
DBF
P2HSEL flag
P2GSEL flag
P2FSEL flag
P2ESEL flag
PYASEL flag
Remarks 1. P2HSEL, P2GSEL, P2FSEL, and P2ESEL (bits 3 to 0 of LCD port select register; refer to Figure
19-7) set the output of the LCD19/P2H0, LCD18/P2G0, LCD17/P2F0, and LCD16/P2E0 in the LCD
segment signal output or general-purpose output port mode.
2. PYASEL (bit 0 of LCD mode select register; refer to Figure 19-9) sets the output of the LCD15/KS15/
PYA15 through LCD0/KS0/PYA0 pins in the LCD segment signal output or general-purpose output
port mode.
3. LCDEN (bit 1 of LCD mode select register; refer to Figure 19-9) turns on/off all LCD displays.
4. KSEN (bit 2 of LCD mode select register; refer to Figure 19-9) sets the output of the key source
signal.
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Data Sheet U10101EJ4V0DS