st2064b Sitronix Technology Corporation, st2064b Datasheet - Page 18

• Manufacturer Part Number: st2064b
• Description: 8 Bit Microcontroller With 64k Bytes Rom
• Manufacturer: Sitronix Technology Corporation

10.4 COMMON-PORT
The COM15~COM8 can be used as LCD drivers or output
ports.
COM15~COM8 output ports, which pin assignment will be
Ver. 3.0
Address Name
Address Name
$039
$036
Bit [7~6]:DUTY : Common output selection bit
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
In output port mode, COM[7~0] will be map to
LSEL
COM
0X = 1/16 duty and COM15~COM8 used as LCD Common pins
10 = 1/12 duty and COM15~COM12 used as output pins
11 = 1/8 duty and COM15~COM8 used as output pins
1 = COM15 output =FLOATING
0 = COM15 output =LOW
1 = COM14 output = FLOATING
0 = COM14 output =LOW
1 = COM13 output = FLOATING
0 = COM13 output =LOW
1 = COM12 output = FLOATING
0 = COM12 output =LOW
1 = COM11 output = FLOATING
0 = COM11 output =LOW
1 = COM10 output = FLOATING
0 = COM10 output =LOW
1 = COM9 output = FLOATING
0 = COM9 output =LOW
1 = COM8 output = FLOATING
0 = COM8 output =LOW
COM[7] : COM15 scan output bit
COM[6] : COM14 scan output bit
COM[5] : COM13 scan output bit
COM[4] : COM12 scan output bit
COM[3] : COM11 scan output bit
COM[2] : COM10 scan output bit
COM[1] : COM9 scan output bit
COM[0] : COM8 scan output bit
R/W
R/W
R/W
R/W
DUTY[1] DUTY[0]
COM[7] COM[6] COM[5] COM[4] COM[3] COM[2] COM[1] COM[0]
Bit 7
Bit 7
TABLE 10-11 LCD Segment Number Selection Register (LSEL)
Bit 6
Bit 6
TABLE 10-12 COM Output Register (COM)
BIAS4
Bit 5
Bit 5
LSEL[4] LSEL[3] LSEL[2] LSEL[1] LSEL[0]
18/57
Bit 4
Bit 4
decided by DUTY[1:0] of $39(LSEL), Please refer to the
following table.
Bit 3
Bit 3
Bit 2
Bit 2
Bit 1
Bit 1
Bit 0
Bit 0
???? ????
0001 1111
Default
Default
ST2064B
5/8/09