
OPERATION PANEL CONTROLLER
M66271FP
MITSUBISHI <DIGITAL ASSP>
Control register
M66271FP has 9 kinds of control register.
To set mode from MPU to control register,use IOCS,
LWR,RD,A<4:0> and D<7:0>.
(1) Kind of control register
Kind of register
Address
Functions of register
R/W
No.
Name
A3 A2 A1
R2
Horizontal display
character number
register
Set the number of horizontal display
characters per line.
W
R3
Horizontal
synchronous pulse
width register
Set the pulse width of LP per line.
W
R5
Set the number of display line of
vertical direction.
W
Set the display start address of VRAM.
Set lower 8-bit to SAL and upper 6-bit to
SAH. Max=257F
H
Control register Table
R6
Display start
address register
R7
R/W
R1 Mode register
D6 – D0 set the basic mode.
D7 is the status register of cycle steal
state.
R4
Cycle steal enable
width register
Set the term of cycle steal enable access
during horizontal synchronous term.
W
R8
M cycle variable
register
Set the cycle of LCD alternating signal
from M .
W
D7=Only
"R"
R/W
A0
Data
D7
D6
D5
D4
D3
D2
D1
D0
CR
LPW
SLT
SAL
SAH
DISP
REV
LCDE
OSCC
CSW
MT
CSES
A4
R9
R10
R11
Data port
register
VRAM address
index register
0 1
0
0
0
1 0
0
0
0
0 0
0
0
0
1 1
0
0
0
0 1
1
0
0
1 0
1
0
0
0 0
1
0
0
1 1
1
0
0
0 0
0
0
1
0 1 0
0
1
1 0
0
0
1
Data port register for accessing VRAM
through the register.
Set the address for accessing VRAM.
Set lower 8-bit to IDXL and upper 6-bit to
IDXH. Max=257F
H
And automatically increase in continuous
address .
R/W
DP
IDXL
IDXH
R/W
Note:Data port register(DP) and VRAM address index register(IDXL,IDXH) are exclusive register,when using this IC for
the LCD module built-in system.
When RESET,each register is initialize the setting which is assumed LCD size of 320
×
240 dots.
Then,even if each register has not setting,output the signal to LCD side ,it is possible to be alternation of LCD.
RESET
Vertical line
number register