hd66420 Renesas Electronics Corporation., hd66420 Datasheet - Page 14

• Manufacturer Part Number: hd66420
• Description: Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
• Manufacturer: Renesas Electronics Corporation.

HD66420
Multi-LSI Operation
Using multiple HD66420s provides the means for extending the number of display dots. Note the following
items when using the multi-LSI operation.
(1) The master LSI and the slave LSI must be determined; the M/S pin of the master LSI must be set high
(2) The master LSI supplies the FLM, M, CL1 and clock signals to the slave LSI via the corresponding
(3) All control bits of slave LSI must be set with the same data with that of the master LSI.
(4) All LSIs must be set to LCD off in order to turn off the display.
(5) The standby function of slave LSI must be started up first, and that of the master LSI must be
(6) The power supply circuit of slave LSI stop working, so V1 to V5 levels are supplied from the master
Figure 6 shows the configuration using two HD66420s and table 2 lists the differences between master and
slave modes.
14
40-channel
row output
and the M/S pin of the slave LSI must be set low.
pins, which synchronizes the slave LSI with the master LSI.
terminated first.
LSI. If the internal power supply circuit can not drive two LSIs, use an external power supply circuit.
OSC OSC1
CO
HD66420
(Master)
160-channel
column output
M
Figure 6 Configuration Using Two HD66420s
FLM
V1O to
V5O
CL1
Dot-matrix Display
320 x 80
V1O to
V5O
M
160-channel
column output
FLM
HD66420
(slave)
CL1
CO OSC1
Open
OSC
40-channel
row output