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
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