GMS81C7216 Datasheet, PDF (69/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
18. LCD DRIVER
The GMS81C7208/16 has the circuit that directly drives the liq-
uid crystal display (LCD) and its control circuit. In addition,
VCLn pin is provided as the drive power pin.
1/4 Duty:
1/3 Duty:
1/2 Duty:
Static:
GMS81C7208/16
17 SEG × 4COM
18 SEG × 3COM
19 SEG × 2COM
20 SEG × 1COM
Basically, the GMS81C7208/16 has 17 seg.× 4 com. ports of
LCD driver. Extend display modes are shown in left table.
Figure 18-1shows the configuration of the LCD driver.
********Caution********
When you developing the software using by
Emulator, you must select the external bias re-
sistor mode because of no internal bias resistor
inside the Emulator (EVA. chip).
Select
SEG or Normal port
by LPMR [0F2_H]
SEG0/R40
Display Memory
(27 × 4 bits)
WTCK[1:0]
reserved
f_MAIN÷2⁷
00
01
MUX
÷ 32
÷ 64
÷ 128 ^MUX
÷ 256
Control frame frequency
LCR
Enable LCD
Control bias voltage and resistor
[0F1_H]
LPMR[1:0]
“Same with above”
LPMR[3:2]
“Same with above”
LPMR[5:4]
SEG7/R47
SEG8/R50
SEG11/R53
SEG16/R60
SEG20/R64
COM0
COM1/SEG26
COM2/SEG25
COM3/SEG24
LCR[3:2] of address 0F1_H
BIAS
VCL2
VCL1
VCL0
Figure 18-1 LCD Driver Block Diagram
FEB. 2005 Ver 1.04
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