RCM2122R データシートの表示（PDF） - ROHM Semiconductor
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RCM2122R Datasheet PDF : 10 Pages
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Liquid Crystal Displays
RCM2122R
!Instruction
There are two resistors of instruction resistor and data resistor inside the driver IC.
And perform the internal operation at recorded the control information temporary here for enabling interface the various
CPU or control IC which have different speed than internal operation.
Internal operation is controlled by resistor select signal, read and write signal, and data bus signal.
List of instruction and operation time are mentioned below.
Instruction
Clear display
Cursor at home
Entry mode
Code
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Description
Execution time(Max.)
(fCP or fosc=270kHz)
Cursor is returned to home position
0 0 0 0 0 0 0 0 0 1 (address o) after entire display clear.
2.2ms
Cursor is returned to home position
∗ 0 0 0 0 0 0 0 0 1
(address o). Shifted display is also returned
to the original position. Contens of DDRAM
are not changed.
2.2ms
Cursor advance direction and display shift
are set. These operation are performed
0 0 0 0 0 0 0 1 I / D S during data write and read modes.
53µs
Display ON / OFF
control
Entire display ON / OFF (D), cursor ON /
0 0 0 0 0 0 1 D C B OFF (C), and character blink (B) at cursor
position are set.
Cursor / Display shift
∗ ∗ 0 0 0 0 0 1 S/C R/L
Cursor and dispaly are shifted without
changing the contents of DDRAM.
Function set
∗ ∗ ∗ 0 0 0 0 1 DL A
Interface data length (DL), Addressing
mode of DDRAM (A) are set.
CG RAM address set
0 0 0 1∗
ACG
CGRAM address is set. After this what is
transmitted and received is the data of
CGRAM.
DDRAM address is set. After this what is
DD RAM address set
001
ADD
transmitted and received is the data of
DDRAM.
Busy flag / Address read 0 1 BF ∗ ∗
ACDD
ACCG
Busy flag (BF) showing internal operation
and contents of address counter are read.
CG RAM / DD RAM
data read
Write Data (DD RAM)
1
0
∗∗
∗ Data are written in DDRAM or CGRAM
Write Data (CG RAM)
CG RAM / DD RAM
data read
Read Data (DD RAM)
Data are read out of DDRAM or CGRAM
1 1 ∗ ∗ ∗ Read Data (CG RAM)
I / D=1 : Increment
I / D=0 : Decrement
S=1 : With display shift
S / C=1 : With display shift
S / C=0 : Cursor movement
R / L=1 : Shift to the right
R / L=0 : Shift to the left
DL=1 : 8bits
DL=0 : 4bits
A=0 : Addressing mode 1
A=1 : Addressing mode 2
BF=1 : Internal operation is being performed
BF=0 : Instruction acceptable ∗ Don't care
DD RAM : Display data RAM
CG RAM : Character generator RAM
ACG : Address of CGRAM
ADD : Address of DDRAM
These correspond to cursor address.
AC :Address counter used for both
DDRAM and CGRAM.
53µs
80µs
53µs
53µs
53µs
0µs
53µs
80µs
Exchange time
changes with
change in
internal
oscillation
frequency (fosc)
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