µPD16661A
11. SYSTEM CONFIGURATION EXAMPLE
This is an example of the configuration of a liquid-crystal panel of half VGA size (480 × 320, perpendicular) using
four µPD16661A devices and two row drivers.
• Each column driver sets the LSI No. with the PL0, PL1, and PL2 pins.
• The DIR pin of each column driver is set to low.
• One of the column drivers only is set to master; all the others are set to slave. Signals are supplied from the
master column driver to the slave column drivers and the row drivers.
• The OSC1 and OSC2 pins have an oscillator resistor attached on the master, and are left open on the slaves.
• All the signals from the system side (D0 to D15, A0 to A16, /CS, /OE, /WE, /UBE, RDY, /RESET, /DOFF) are
connected in parallel to the column driver. A pull-up resistor is attached to the RDY signal.
• The TEST pin is used to test the LSI, and is left open or connected to the GND when the system is configured.
VCC2
STB
/FRM
/DOUT,/DOFF'
L1
L2
/REFRH
Row
driver
Master
No.0
OSC1
OSC2
Slave
No.2
Y1
Y160 Y1
Scan direction
Y160
240
RDY
/DOFF
/RESET
D0 to D15
A0 to A16
Control
( /CS, /OE,
/WE, /UBE)
Row
driver
Scan direction
240
Y160
Y1 Y160
Y1
Slave
No.1
Slave
No.3
Remark /DOFF’ is an input pin of row driver.
19