參數(shù)資料
型號： PCF2113D
廠商： NXP Semiconductors N.V.
英文描述： LCD controller/driver
中文描述： LCD控制器/驅(qū)動器
文件頁數(shù)： 48/72頁
文件大?。?/td> 332K
代理商： PCF2113D
2001 Dec 19
48
Philips Semiconductors
Product specification
LCD controllers/drivers
PCF2113x
16.2
4-bit operation, 1-line display using internal
reset
The program must set functions prior to a 4-bit operation
(see Table 12). When power is turned on, 8-bit operation
is automatically selected and the PCF2113x attempts to
perform the first write as an 8-bit operation. Since nothing
is connected to DB0 to DB3, a rewrite is then required.
However, since one operation is completed in two
accesses of 4-bit operation, a rewrite is required to set the
functions (see Table 12 step 3). Thus, DB4 to DB7 of the
‘function set’ are written twice.
16.3
8-bit operation, 1-line display using internal
reset
Tables 13 and 14 show an example of a 1-line display in
8-bit operation. The PCF2113x functions must be set by
the ‘function set’ instruction prior to display. Since the
DDRAM can store data for 80 characters, the RAM can be
used for advertising displays when combined with display
shift operation. Since the display shift operation changes
display position only and the DDRAM contents remain
unchanged, display data entered first can be displayed
when the ‘return home’ operation is performed.
16.4
8-bit operation, 2-line display
For a 2-line display the cursor automatically moves from
the first to the second line after the 40th digit of the first line
has been written. Thus, if there are only 8 characters in the
first line, the DDRAM address must be set after the 8th
character is completed (see Table 15). It should be noted
that both lines of the display are always shifted together;
data does not shift from one line to the other.
16.5
I
2
C-bus operation, 1-line display
A control byte is required with most commands
(see Table 16).
Table 12
4-bit operation, 1-line display example using internal reset
STEP
INSTRUCTION
DISPLAY
OPERATION
1
power supply on (PCF2113x is initialized by
the internal reset)
function set
RS
R/W
DB7
0
0
0
initialized; no display appears
2
DB6
0
DB5
1
DB4
0
sets to 4-bit operation; in this instance operation
is handled as 8-bits by initialization and only this
instruction completes with one write
3
function set
0
0
0
0
0
0
0
0
1
0
0
0
sets to 4-bit operation, selects 1-line display and
V
LCD
= V
0
; 4-bit operation starts from this point
and resetting is needed
4
display control
0
0
entry mode set
0
0
0
0
0
1
0
1
0
1
0
0
_
turns on display and cursor; entire display is
blank after initialization
5
0
0
0
0
0
1
0
1
0
0
_
sets mode to increment the address by 1 and to
shift the cursor to the right at the time of write to
the DD/CGRAM; display is not shifted
6
‘write data’ to CGRAM/DDRAM
1
0
0
1
0
0
1
0
0
0
1
0
P_
writes ‘P’; the DDRAM has already been selected
by initialization at power-on; the cursor is
incremented by 1 and shifted to the right
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