st2024c Sitronix Technology Corporation, st2024c Datasheet - Page 21

• Manufacturer Part Number: st2024c
• Description: 24k 8-bit Single Chip Microcontroller
• Manufacturer: Sitronix Technology Corporation

10.5 COMMON-PORT
The COM4~COM7 can be used as LCD drivers or output
ports.
COM7~COM4 output ports, which pin assignment will be
Ver 2.2
Address Name
Address Name
$03A
$03B
Bit 5:
Bit 4:
Bit 5:
Bit 6:
Bit 7:
In output port mode, SCAN[7~4] will be map to
LCTL
SCAN
COMO : Common output selection bit
SCAN[4] : COM4 scan output bit
SCAN[5] : COM5 scan output bit
SCAN[6] : COM6 scan output bit
SCAN[7] : COM7 scan output bit
1 = COM4~COM7 used as output pins
0 = COM4~COM7 used as LCD Common pins
1 = COM4 output =FLOAT
0 = COM4 output =LOW
1 = COM5 output = FLOAT
0 = COM5 output =LOW
1 = COM6 output = FLOAT
0 = COM6 output =LOW
1 = COM7 output = FLOAT
0 = COM7 output =LOW
R/W
R/W
R/W
W
SCAN[7] SCAN[6] SCAN[5] SCAN[4]
LPWR
Bit 7
Bit 7
TABLE 10-17: SCAN OUTPUT REGISTER (SCAN)
TABLE 10-16: LCD CONTROL REGISTER (LCTL)
BLANK
Bit 6
Bit 6
COMO
Bit 5
Bit 5
21/54
LENH
Bit 4
Bit 4
decided by Bit 5 of LCTL[5], Please refer to the following
table.
SEGO
Bit 3
Bit 3
-
Bit 2
Bit 2
-
-
Bit 1
Bit 1
-
-
DUTY
Bit 0
Bit 0
-
0000 - - - -
0000 0- -0
ST2024C
Default
Default
1/31/08