hd66717 Renesas Electronics Corporation., hd66717 Datasheet - Page 61

• Manufacturer Part Number: hd66717
• Description: Low-power Dot-matrix Liquid Crystal Display Controller/driver -
• Manufacturer: Renesas Electronics Corporation.

Segment Display and Annunciator Display
The HD66717 provides both segment display, which is driven by the multiplexing method, and
annunciator display, which is driven statically. Annunciator display is driven at a logic operating voltage
(V
annunciator display is suitable for displaying marks during system standby, when it is desirable to reduce
current consumption. It is available in sleep mode, where internal multiplexing operations for character or
segment display are halted. If an alternating signal is supplied to the EXM pin, it is also available in
standby mode, where the internal R-C oscillator is halted. Here, AGND must be equal to or above the
GND level.
Note that annunciator display cannot share character display drivers SEG and COM but require special
drivers ASEG and ACOM that require long routing.
Tables 21 to 23 illustrates segment display and annunciator display.
Table 21
Item
Number of driven elements
Blinking
Segment drivers
Common drivers
LCD power supply
Normal mode display
Sleep mode display
Standby mode display
(without oscillation)
CC
– AGND) and is thus also available while the LCD drive power supply is turned off. Accordingly,
Comparison between Segment Display and Annunciator Display
Segment Display
20 each by COMS1 and COMS2
Impossible
SEG1–SEG60
(shared with character display)
COMS1, COMS2
V
(LCD power supply necessary)
Display possible together with
character display by multiplexing drive
Impossible
(SEG and COM output V
Impossible
(SEG and COM output V
CC
– V5
CC
CC
)
)
Annunciator Display
10
Possible
ASEG1–ASEG10
(independent of character display)
ACOM
V
(LCD power supply unnecessary)
Display possible by static drive
Possible by static drive
Possible by supplying alternating
signal to the EXM pin
CC
– AGND
HD66717
513