TC9328AF datasheet(49/84 Pages) TOSHIBA

49 / 84 page

TC9328AF

2004-09-13

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LCD Driver

The LCD driver uses the 1/4 duty and 1/2 bias drive method (62.5-Hz frame frequency).

The common output outputs the VLCD, VLCD/2 (VEE) and the GND electrical potential, and the segment

output outputs the VLCD and GND electrical potential.

A combination of four common outputs and 22 segment outputs enables a maximum of 88 segments to be

illuminated. The S15 to S22 pin for LCD driver are also used as the I/O port, after system reset is set as an

I/O Port, and can perform a change of an I/O Port and a segment output per 1 bit. All LCD output pins

(COM1-S14) can be changed to an output port. The LCD driver is built-in a constant voltage circuit (VEE =

1.5 V) for display purposes and a voltage doubler circuit (VLCD = 3.0 V), The constant voltage circuit for

display (VEE) is used as for twice doubler voltage (VDB) is used. For this reason, LCD display stabilized

even if power supply voltage was set to 0.9 V is possible.

LCD Driver Port

Note: When “1” is set at DISP OFF bit, common output becomes VEE level and all displays are turned off.

Different from the situation in which all segment data is set to “0” at display status, the contrast slightly

becomes bad. If extinguished status by DISP OFF bit is not favorable, set “0” to DISP OFF bit and all

segment data, or set “1” to LCD bit and output “L” level at output port.

Note: Segment data controls lighting/putting out lights of the segment corresponding to a common output and a

segment output.

Note: At the time of clock stop mode and about 100 ms after system reset, all the common output and segment

output are fixed at “L” level.

Buffer capacity bit of output port (OT)

Note: It is available only when output port is set. When

LCD is output, low buffer output is available.

S19

S20

S21

S22

Segment /IO select

S15

S16

S17

S18

Segment /IO select

COM1 COM2 COM3 COM4

S22

COM1 COM2 COM3 COM4

S16

Change for segment and I/O port

0: I/O port

1: Segment output

LCD display off control bit

0: All LCD display illuminated

1: All LCD display extinguished

LCD off control bit

0: LCD output setting

1: Output port setting

DISP

OFF

LCD

OFF

OTB

-UP

φL2D

SEL1

SEL2

SEL4

SEL8

Data select

Segment-1 data

φL2E

COM1 COM2 COM3 COM4

S19

S18

Segment-2 data

φL2F

COM1 COM2 COM3 COM4

S17

Segment data

0: Illuminated

1: Extinguished

0: Low output buffer

1: High output buffer

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