ra8835 Topway Display, ra8835 Datasheet - Page 19

• Manufacturer Part Number: ra8835
• Description: Dot Matrix Lcd Controller
• Manufacturer: Topway Display

RAiO TECHNOLOGY INC.
Version 1.7
6-3 Display Control Commands
6-3-1 DISP ON/OFF
YDIS signal. Using the YDIS signal to disable the Y-drivers guards against any spurious displays.
The internal registers of the RA8835 series maintain their values during the sleep state. The
display memory control pins maintain their logic levels to ensure that the display memory is not
corrupted. The RA8835 series can be removed from the sleep state by sending the SYSTEM SET
command with only the P1 parameter. The DISP ON command should be sent next to enable the
display.
Turn the whole display on or off. The single-byte parameter enables and disables the cursor and
layered screens, and sets the cursor and screen flash rates. The cursor can be set to flash over
one character or over a whole line.
6-3-1-1 D
Turn the display ON or OFF. The D bit takes precedence over the FP bits in the parameter.
D = 0: Display OFF
D = 1: Display ON
6-3-1-2 FC
Enables/disables the cursor and sets the flash rate. The cursor flashes with a 70% duty cycle
(ON/OFF).
1. The YDIS signal goes LOW between one and two frames after the SLEEP IN command is
2. Since all internal clocks in the RA8835 series are halted while in the sleep state, a DC voltage
3. Note that, although the bus lines become high impedance in the sleep state, pull-up or pull-
down resistors on the bus will force these lines to a known state.
received. Since YDIS forces all display driver outputs to go to the deselected output voltage,
YDIS can be used as a power-down signal for the LCD unit. This can be done by having YDIS
turn off the relatively high power LCD drive supplies at the same time as it blanks the display.
will be applied to the LCD panel if the LCD drive supplies remain on. If reliability is a prime
consideration, turn off the LCD drive supplies before issuing the SLEEP IN command.
P1
C
MSB
Figure 6-10: DISP ON/OFF Parameters
FP5
C
0
MSB
Figure 6-9: SLEEP IN Instruction
FP4
0
1
1
FP3
0
0
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FP2
1
1
0
FP1
1
0
FP0
1
0
1
FC1
0
LSB
FC0
D
LSB
Dot Matrix LCD Controller
www.raio.com.tw
RA8835