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Teilenummer | RA8835 |
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Beschreibung | Dot Matrix LCD Controller | |
Hersteller | RAIO Technology | |
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Gesamt 30 Seiten RAiO
RA8835
Dot Matrix
LCD Controller
Specification
Version 2.2
June 06, 2008
RAiO Technology Inc.
©Copyright RAiO Technology Inc. 2008
RAiO TECHNOLOGY INC.
1/93
www.raio.com.tw
Version 2.2
RA8835
Dot Matrix LCD Controller
1. Overview
The RA8835 is a controller IC that can display text and graphics on LCD panel. It can display layered text
and graphics, scroll the display in any direction and partition the display into multiple screens. It also stores
text, character codes and bitmapped graphics data in external frame buffer memory. Display controller
functions include transferring data from the controlling microprocessor to the buffer memory, reading
memory data, converting data to display pixels and generating timing signals for the buffer memory, LCD
panel.
The RA8835 has an internal character generator with 160, 5x7 pixel characters in internal mask ROM. The
character generators support up to 64, 8x16 pixel characters in external character generator RAM and up to
256, 8x16 pixel characters in external character generator ROM.
2. Features
Text, graphics and combined text/graphics
display modes
Three overlapping screens in graphics
mode
Up to 640x256 pixel LCD panel display
resolution
Programmable cursor control
Smooth horizontal and vertical scrolling of
all or part of the display
1/2-duty to 1/256-duty LCD drive
Up to 640x256 pixel LCD panel display
resolution memory
160, 5x7 pixel characters in internal mask-
programmed character generator ROM
3. Block Diagram
Up to 64, 8x16 pixel characters in external
character generator RAM
Up to 256, 8x16 pixel characters in external
character generator ROM
6800 and 8080 family microprocessor
interfaces
Low power consumption: 3.5mA operating
current (VDD = 3.5V), 0.05μA standby
current
Package:
RA8835P3N: QFP-60 pin (Lead Free)
RA8835P4N: TQFP-60 pin (Lead Free)
Power: 2.7 to 5.5 V
V A [1 5 :0 ], V D [7 :0 ],
VCE, VRD, VW R
TEST
2 5 6 B yte
CGROM
R e g is te rs
B lo c k
M CU
I/F
D is p la y R A M
I/F
C u rso r
C o n tro lle r
X ’ta l
O SC
S ys te m
C o n fig u re
D a ta
L a tc h
T im in g
G e n e ra to r
D [7 :0 ], C S , R D , W R
A0, R ES, SEL1, SEL2
XD XG
Y D IS , L P , W F , X S C L ,
Y D , Y S C L , X D [3 :0 ]
Figure 3-1: Block Diagram
RAiO TECHNOLOGY INC.
6/93
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6 Page Version 2.2
RA8835
Dot Matrix LCD Controller
6-2 System Control Commands
6-2-1 SYSTEM SET
Initializes the device, sets the window sizes, and selects the LCD interface format. Since this
command sets the basic operating parameters of the RA8835 series, an incorrect SYSTEM SET
command may cause other commands to operate incorrectly.
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
A0 WR RD
C 01 000000
101
P1 0 0 IV 1 W/S M2 M1 M0
001
P2 WF 0 0 0 0
FX
001
P3 0 0 0 0
FY
001
P4 C/R
001
P5 TC/R
001
P6 L/F
001
P7 APL
001
P8 APH
001
Figure 6-1: SYSTEM SET Instruction
6-2-1-1 C
This control byte performs the following:
1. Resets the internal timing generator
2. Disables the display
3. Cancels sleep mode
Parameters following P1 are not needed if only canceling sleep mode.
6-2-1-2 M0
Select the internal or external character generator ROM. The internal character generator ROM
contains 160, 5 X 7 pixel characters, as shown in Figure 8-14. These characters are fixed at
fabrication by the metallization mask.
The external character generator ROM, on the other hand, can contain up to 256 user-defined
characters.
M0 = 0: Internal CG ROM
M0 = 1: External CG ROM
Note that if the CG ROM address space overlaps the display memory address space, that portion
of the display memory cannot be written to.
RAiO TECHNOLOGY INC.
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12 Page | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ RA8835 Schematic.PDF ] |
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