參數(shù)資料
型號： W741C250
英文描述： 4-Bit Microcontroller
中文描述： 4位微控制器
文件頁數(shù)： 24/88頁
文件大?。?/td> 449K
代理商： W741C250
W741C250
- 24 -
The LCDON instruction turns the LCD display on (even in HOLD mode), and the LCDOFF instruction
turns the LCD display off. At initial reset, all the LCD segments are lit. When the initial reset state
ends, the LCD display is turned off automatically. To turn on the LCD display, the instruction LCDON
must be executed. When the drive output pins are used as DC output ports (set by option codes,
please refer the user's manual of ASM741S assembler for more detail), CMOS output type or NMOS
output type can be selected by executing the instruction MOV LCDM, #I. The relation between the
LCD data RAM and segment/common pins is shown below. The data in LCDR00 are transferred to
the corresponding segment output port (SEG3 to SEG0) by a direct memory access. The other LCD
data RAM segments can be used as normal data RAM to store data.
LCD DATA RAM
OUTPUT PIN
SEG3
SEG0
BIT 3
BIT 2
BIT 1
BIT 0
LCDR00
LCDR03
LCDR01
LCDR04
LCDR07
LCDR05
SEG3
-
SEG7
-
.
.
.
SEG23
-
SEG2
-
SEG6
-
.
.
.
SEG22
-
SEG1
-
SEG5
-
.
.
.
SEG21
-
SEG0
-
SEG4
-
.
.
.
SEG20
-
-
SEG7
SEG4
-
.
.
.
.
.
.
LCDR14
LCDR17
LCDR15
SEG23
SEG20
-
The relationship between the LCD drive mode and the maximum number of drivable LCD segments
is shown below.
LCD DRIVE MODE
MAX. NUMBER OF
DRIVABLE LCD SEGMENTS
CONNECTION AT
POWER INPUT
Static
24 (COM1)
48 (COM1
COM2)
72 (COM1
COM3)
72 (COM1
COM3)
96 (COM1
COM4)
Connect V
DD3,
V
DD2
to
V
DD1
1/2 bias 1/2 duty
Connect V
DD3
to V
DD2
1/2 bias 1/3 duty
Connect V
DD3
to V
DD2
1/3 bias 1/3 duty
-
1/3 bias 1/4 duty
-
LCD Output Mode Type Flag (LCDM)
The LCD output mode type flag is organized as a 6-bit binary register (LCDM.0 to LCDM.5). These
bits are used to control the LCD output pin architecture. When the LCD output pins are set to DC
output mode by option codes, the architecture of these output pins (segment 0 to segment 23) can be
selected as CMOS or NMOS type by the MOV LCDM, #I instruction. The bit descriptions are as
follows:
w
1
2
3
LCDM
4
w
w
5
0
w
w
w
Note: W means write only.
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