ra8816 RAIO Technology Inc., ra8816 Datasheet - Page 39

• Manufacturer Part Number: ra8816
• Description: 144x65 Character/graphic Lcd Driver
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.6
RAiO TECHNOLOGY INC.
6-5 Interrupt
6-4-4 LCD Driver
The RA8816 provide an interrupt signal( INT ) to response three possible interrupt:
The interrupt of above can be enabled or disable by register. The MPU can read the interrupt message
form interrupt status register. The INT is active low, so when MPU detect the interrupt happen then
must clear interrupt status for INT return to high. If user do not use the hardware interrupt( INT ), then
MPU can get the interrupt message by reading the status register.
The Segment/Common Driver of RA8816 is used to latch the data of pre-stage, then send to Level
Shifter for combination. The combined data will follow the Timing Generator to control the switchs
then pass the V0~V4 to Common and Segment.
The LCD Bias of RA8816 is adjustable by register CSTR that from 1/5 to 1/9. The user can also
adjust the display quality from this register. Meanwhile, the driving current is also adjustable by
register DRCR_B that in order to meet different panel.
The DOFF_Z of register PWRR is used to cotrol the On/Off of LCD Panel, When DOFF_Z is set to
“0” then LCD Driver was closed. At this state, the driver output signals COM0~COM63,
SEG0~SEG143, COMS_A and COMS_B are connected to GND, and the screen of LCD Panel
turned Off.
Busy Interrupt– When the data write to display RAM was complete.
Scroll Interrupt - When the scroll window shifted 1, 8 or 16-pixels.
Key-scan Interrupt - When a key was pressed.
Figure 6-29: The Segment and Common Driver
COMS
Common
Segment
Drivers
Drivers
144
39/68
65
SEG0~SEG143
COM0~COM63
COMS_A
COMS_B
144x65 Character/Graphic LCD Driver
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RA8816