PCF2114 查看數據表（PDF） - NXP Semiconductors.
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PCF2114 Datasheet PDF : 64 Pages
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Philips Semiconductors
LCD controller/drivers
Product specification
PCF2116 family
18.1 8-bit operation, 1-line display using internal
reset
Table 6 shows an example of a 1-line display in 8-bit
operation. The PCF2116 functions must be set by the
‘Function set’ instruction prior to display. Since the display
data RAM 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 DDRAM contents
remain unchanged, display data entered first can be
displayed when the Return Home operation is performed.
18.2 4-bit operation, 1-line display using internal
reset
The program must set functions prior to 4-bit operation.
Table 5 shows an example. When power is turned on, 8-bit
operation is automatically selected and the PCF2116
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 5 step 3).
Thus, DB4 to DB7 of the function set are written twice.
18.3 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 eighth
character is completed (see Table 7). Note that both lines
of the display are always shifted together; data does not
shift from one line to the other.
18.4 I2C operation, 1-line display
A control byte is required with most instructions
(see Table 8).
18.5 Initializing by instruction
If the power supply conditions for correctly operating the
internal reset circuit are not met, the PCF2116 must be
initialized by instruction. Tables 9 and 10 show how this
may be performed for 8-bit and 4-bit operation.
Table 5 4-bit operation, 1-line display example; using internal reset
STEP
INSTRUCTION
1 power supply on (PCF2116 is initialized by
the internal reset circuit)
2 function set
RS R/W DB7 DB6 DB5 DB4
0
0
0
0
1
0
3 function set
0
0
0
0
1
0
0
0
0
0
0
0
4 display on/off control
0
0
0
0
0
0
0
0
1
1
1
0
5 entry mode set
0
0
0
0
0
0
0
0
0
1
1
0
6 write data to CGRAM/DDRAM
1
0
0
1
0
1
1
0
0
0
0
0
DISPLAY
_
_
P_
OPERATION
Initialized. No display appears.
Sets to 4-bit operation. In this instance operation
is handled as 8-bits by initialization and only this
instruction completes with one write.
Sets to 4-bit operation, selects 1-line display and
VLCD = V0. 4-bit operation starts from this point
and resetting is needed.
Turns on display and cursor. Entire display is
blank after initialization.
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.
Writes ‘P’. The DDRAM has already been
selected by initialization at power-on. The cursor
is incremented by 1 and shifted to the right.
1997 Apr 07
42
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