Datasheet
71M6543F/71M6543G Data Sheet
64 v2
The LCD bias may be compensated for temperature using the LCD_DAC[4:0] field (I/O RAM 0x240D[4:0]).
The bias may be adjusted from 1.4 V below the 3.3 V supply (V3P3SYS in MSN mode and VBAT in BRN
and LCD modes). When the LCD_DAC[4:0] field is set to 000, the DAC is bypassed and powered
down. This setting can be used to reduce current in LCD mode.
Figure 17: LCD Waveforms
SEG46 through SEG50 cannot be configured as DIO pins. Display data for these pins are written to I/O
RAM registers LCD_SEG46[5:0] through LCD_SEG50[5:0] (see Table 53).
Table 53: LCD Data Registers for SEGDIO46 to SEGDIO55
SEGDIO
46
47
48
49
50
51
52
53
54
55
Pin #
93 92 58 57 56
53
52
51
47
46
Configuration: Always LCD pins See 2.5.10.2
SEG Data
Register
LCD_SEGDIO46[5:0]
(I/O RAM 0x243E[5:0]
LCD_SEGDIO47[5:0]
(I/O RAM 0x243F[5:0])
LCD_SEGDIO48[5:0]
(I/O RAM 0x2440[5:0]
LCD_SEGDIO49[5:0]
(I/O RAM 0x2441[5:0])
LCD_SEGDIO50[5:0]
(I/O RAM 0x2442[5:0])
LCD_SEGDIO51[5:0]
(I/O RAM 0x2443[5:0])
LCD_SEGDIO52[5:0]
(I/O RAM 0x2444[5:0])
LCD_SEGDIO53[5:0]
(I/O RAM 0x2445[5:0])
LCD_SEGDIO54[5:0]
(I/O RAM 0x2446[5:0])
LCD_SEGDIO55[5:0]
(I/O RAM 0x2447[5:0])
The LCD_MAP[47:46] (I/O RAM 0x2406[7:6]) bits are used to determine whether SEG46 and SEG47 are
SEG pins or their alternate function (see pins 93 and 92 in Figure 42). If the LCD_MAP[47:46] bits are 1,
then the pins are configured as SEG pins. If the LCD_MAP[47:46] bits are 0, then the pins are configured
as their alternate functions (TMUX2OUT and TMUXOUT, respectively).
STATIC (LCD_MODE=100)
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
(1/2)
(1/2)
(1/2)
(1/2)
(1/2)
1/2 BIAS, 2 STATES (LCD_MODE = 010 )
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
(1/2)
(1/2)
(1/2)
(1/2)
0 1
1/2 BIAS, 3 STATES (LCD_MODE = 011 )
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
(1/2)
(1/2)
(1/2)
0 1 2
1/3 BIAS, 3 STATES (LCD_MODE = 011 )
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
(2/3)
0 1 2
(1/3)
1/3 BIAS, 4 STATES (LCD_MODE = 000 )
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
0 1 2
1/3 BIAS, 6 STATES (LCD_MODE = 110 )
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
0 1 2
3
3 4 5
T