TMP86FS23UG datasheet(178/252 Pages) TOSHIBA

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Page 166

15. LCD Driver

15.3 LCD Display Operation

TMP86FS23UG

15.3 LCD Display Operation

15.3.1 Display data setting

Display data is stored to the display data area (address 0F80H to 0F8FH,16 bytes) in the DBR. The display

data stored in the display data area is automatically read out and sent to the LCD driver by the hardware. The

LCD driver generates the segment signal and common signal according to the display data and driving method.

Therefore, display patterns can be changed by only over writing the contents of display data area by the pro-

gram. Table 15-4 shows the correspondence between the display data area and SEG/COM pins.

LCD light when display data is “1” and turn off when “0”. According to the driving method of LCD, the

number of pixels which can be driven becomes different, and the number of bits in the display data area which

is used to store display data also becomes different.

Therefore, the bits which are not used to store display data as well as the data buffer which corresponds to the

addresses not connected to LCD can be used to store general user process data (see Table 15-3).

Note: –: This bit is not used for display data

15.3.2 Blanking

Blanking is enabled when LCDCR<EDSP> is cleared to “0”.

To blank the LCD display and turn it off, a GND-level signal is output to the COM pin and the port which

can be used as the segment by setting of P*LCR register (*; Port No.). At this time, the power switch of VLC

pin is turned off.

Table 15-3 Driving Method and Bit for Display Data

Driving methods

Bit 7/3

Bit 6/2

Bit 5/1

Bit 4/0

1/4 Duty

COM3

COM2

COM1

COM0

1/3 Duty

–

COM2

COM1

COM0

1/2 Duty

–

COM1

COM0

Static

–

COM0

Table 15-4 LCD Display Data Area (DBR)

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0F80H

SEG1

SEG0

0F81H

SEG3

SEG2

0F82H

SEG5

SEG4

0F83H

SEG7

SEG6

0F84H

SEG9

SEG8

0F85H

SEG11

SEG10

0F86H

SEG13

SEG12

0F87H

SEG15

SEG14

0F88H

SEG17

SEG16

0F89H

SEG19

SEG18

0F8AH

SEG21

SEG20

0F8BH

SEG23

SEG22

0F8CH

SEG25

SEG24

0F8DH

SEG27

SEG26

0F8EH

SEG29

SEG28

0F8FH

SEG31

SEG30

COM3

COM2

COM1

COM0

COM3

COM2

COM1

COM0

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