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10 display waveform generation, 10 display waveform generation -12, Table 20-6. lcd display memory map (1/4 duty) -12 – Maxim Integrated MAXQ Family Users Guide: MAXQ2010 Supplement User Manual

Page 104: Maxq family user’s guide: maxq2010 supplement

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MAXQ Family User’s Guide:

MAXQ2010 Supplement

20-12

20.10 Display Waveform Generation

Once the operational modes and display memory registers on the LCD controller have been properly initialized, the
controller generates the segment and common drive waveforms needed to display the enabled segments on the
attached LCD display.
In static mode, each segment pin is connected to a single LCD segment. There is only one common, or backplane,
signal that is driven by COM0. All on segments are driven for the entire frame period.
In x2 multiplexed mode, also known as 1/2 duty cycle mode, each segment pin can drive up to two LCD segments.
There are two common backplane signals, driven by COM0 and COM1. Each on segment is only driven for half the
frame period.
In x3 multiplexed mode, also known as 1/3 duty cycle mode, each segment pin can drive up to three LCD segments.
There are three common backplane signals, driven by COM0, COM1, and COM2. Each on segment is only driven for
1/3 the frame period.

Table 20-5. LCD Display Memory Map (1/3 Duty) (continued)

Table 20-6. LCD Display Memory Map (1/4 Duty)

REGISTER

BIT 7

BIT 6

COM2

BIT 5

COM1

BIT 4

COM0

BIT 3

BIT 2

COM2

BIT 1

COM1

BIT 0

COM0

LCD17

SEG35

SEG35

SEG35

SEG34

SEG34

SEG34

LCD18

SEG37

SEG37

SEG37

SEG36

SEG36

SEG36

LCD19

SEG39

SEG39

SEG39

SEG38

SEG38

SEG38

LCD20

SEG40

SEG40

SEG40

REGISTER

BIT 7

COM3

BIT 6

COM2

BIT 5

COM1

BIT 4

COM0

BIT 3

COM3

BIT 2

COM2

BIT 1

COM1

BIT 0

COM0

LCD0

SEG1

SEG1

SEG1

SEG1

SEG0

SEG0

SEG0

SEG0

LCD1

SEG3

SEG3

SEG3

SEG3

SEG2

SEG2

SEG2

SEG2

LCD2

SEG5

SEG5

SEG5

SEG5

SEG4

SEG4

SEG4

SEG4

LCD3

SEG7

SEG7

SEG7

SEG7

SEG6

SEG6

SEG6

SEG6

LCD4

SEG9

SEG9

SEG9

SEG9

SEG8

SEG8

SEG8

SEG8

LCD5

SEG11

SEG11

SEG11

SEG11

SEG10

SEG10

SEG10

SEG10

LCD6

SEG13

SEG13

SEG13

SEG13

SEG12

SEG12

SEG12

SEG12

LCD7

SEG15

SEG15

SEG15

SEG15

SEG14

SEG14

SEG14

SEG14

LCD8

SEG17

SEG17

SEG17

SEG17

SEG16

SEG16

SEG16

SEG16

LCD9

SEG19

SEG19

SEG19

SEG19

SEG18

SEG18

SEG18

SEG18

LCD10

SEG21

SEG21

SEG21

SEG21

SEG20

SEG20

SEG20

SEG20

LCD11

SEG23

SEG23

SEG23

SEG23

SEG22

SEG22

SEG22

SEG22

LCD12

SEG25

SEG25

SEG25

SEG25

SEG24

SEG24

SEG24

SEG24

LCD13

SEG27

SEG27

SEG27

SEG27

SEG26

SEG26

SEG26

SEG26

LCD14

SEG29

SEG29

SEG29

SEG29

SEG28

SEG28

SEG28

SEG28

LCD15

SEG31

SEG31

SEG31

SEG31

SEG30

SEG30

SEG30

SEG30

LCD16

SEG33

SEG33

SEG33

SEG33

SEG32

SEG32

SEG32

SEG32

LCD17

SEG35

SEG35

SEG35

SEG35

SEG34

SEG34

SEG34

SEG34

LCD18

SEG37

SEG37

SEG37

SEG37

SEG36

SEG36

SEG36

SEG36

LCD19

SEG39

SEG39

SEG39

SEG39

SEG38

SEG38

SEG38

SEG38

LCD20