hd66710 Renesas Electronics Corporation., hd66710 Datasheet - Page 31

• Manufacturer Part Number: hd66710
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Renesas Electronics Corporation.

Table 7
Instruction RS
Read busy
flag &
address
Write data
to RAM
(RE = 0/1)
Read data
from RAM
(RE = 0/1)
Notes: 1. — indicates no effect.
2. Extension time changes as frequency changes. For example, when f is 300 kHz, the execution
3. Execution time in a low power mode (LP = 1 & EXT = low) becomes four times as long as for a
0
1
1
I/D
I/D
S
D
C
B
FW = 1: 6-dot font width
B/W = 1: Black-white inverting cursor on
NW = 1: Four lines
NW = 0: One or two lines
S/C = 1: Display shift
S/C = 0: Cursor move
R/L = 1: Shift to the right
R/L = 0: Shift to the left
DL
N
RE = 1: Extension register access enable
BE = 1: CGRAM/SEGRAM blinking enable
LP
BF
BF
*
time is: 37 µs
1-line mode, and twice as long as for a 2- or 4-line mode.
Instructions (cont)
After execution of the CGRAM/DDRAM/SEGRAM data write or read instruction, the RAM
address counter is incremented or decremented by 1. The RAM address counter is updated
after the busy flag turns off.
In Figure 12, t
updated.
= 1: Increment
= 0: Decrement
= 1: Accompanies display shift
= 1: Display on
= 1: Cursor on
= 1: Blink on
= 1: 8 bits, DL = 0: 4 bits
= 1: 2 lines, N = 0: 1 line
= 1: Low power mode
= 1: Internally operating
= 0: Instructions acceptable
R/
1
0
1
: :
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Description
BF
AC
270/300 = 33 µs.
ADD
is the time elapsed after the busy flag turns off until the address counter is
AC
Write data
Read data
Code
AC
AC
AC
AC
AC
Reads busy flag (BF)
indicating internal operation
is being performed and reads
address counter contents.
Writes data into DDRAM,
CGRAM, or SEGRAM. To
write data to DDRAM
CGRAM, clear RE to 0; or to
write data to SEGRAM, set
RE to 1.
Reads data from DDRAM,
CGRAM, or SEGRAM. To
read data from DDRAM or
CGRAM, clear RE to 0; to
read data from SEGRAM,
set RE to 1.
DDRAM:
CGRAM: Character
SEGRAM: Segment RAM
ACG: CGRAM address
ADD: DDRAM address
ASEG: Segment RAM
HDS: Horizontal dot scroll
AC:
(corresponds to
cursor address)
address
quantity
Address counter
used for both DD,
CG, and SEGRAM
addresses.
Display data
RAM
generator RAM
Execution Time
(max) (when f
f
0 µs
37 µs
t
37 µs
ADD
t
OSC
ADD
= 5.5 µs*
HD66710
is 270 kHz)
= 5.5 µs*
cp
321
or