hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 63

• Manufacturer Part Number: hd66712u
• Description: Dot-matrix Liquid Crystal Display Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66712U
Table 17
Step
No.
1
2
3
4
5
6
7
8
9
Note:
426
RS
Power supply on (the HD66712 is initialized by
the internal reset circuit)
Function set
0
—
Function set
0
0
Function set
0
0
Return home
0
0
Display on/off control
0
0
Entry mode set
0
0
Write data to CGRAM/DDRAM
1
1
The control is the same as for 8-bit operation beyond step #8.
1. When DB3 to DB0 pins are open in 4-bit mode, the RE, BE, LP bits are set to “1” at step #2.
R/
0
—
0
0
0
0
0
0
0
0
0
0
0
0
So, these bits are clear to “0” at step #3.
: :
4-Bit Operation, 24-Digit
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Display
0
—
0
0
0
0
0
0
0
1
0
0
0
1
0
—
0
1
0
0
0
0
0
1
0
1
1
0
1
—
1
0
1
*
0
1
0
1
0
1
0
0
Instruction
·
·
·
·
·
0
—
0
0
0
*
0
0
0
0
0
0
0
0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1-Line Display Example with Internal Reset
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
·
·
·
·
·
H_
_
_
Operation
Initialized. No display.
Sets to 4-bit operation. Clear bit
2. In this case, operation is
handled as 8 bits by
initialization. *
Sets 4-bit operation and
selects1-line display. Clear BE,
LP bits. 4-bit operation starts
from this step.
Sets 4-bit operation and
selects1 line display. Clear bit 2
(RE).
Returns both display and cursor
to the original position (address
0).
Turns on display and cursor.
Entire display is in space mode
because of initialization.
Sets mode to increment the
address by one and to shift the
cursor to the right at the time of
write to the DD/CGRAM.
Display is not shifted.
Writes H.
DDRAM has already been
selected by initialization.
Based on 8-bit operation after
this instruction
1