ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 21

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
RAiO
REG [90h] Idle Time Counter Register (ITCR)
REG [A0h] Key-Scan Control Register 1 (KSCR1)
TECHNOLOGY INC.
7-0
5-4
Bit
Bit
7
6
3
Idle Time Setting, in count of system clock.
The value can determine the scan time of each COM of the LCD.
In which,
COM_PRD: The finally scan period for each COM(Unit : ns).
COM_SCAN: The really scan time for each COM.
XCK_PRD: One cycle time of XCK. XCK is depends on the system
SEG_NO: Segment number, i.e. 240x160 panel, SEG_NO = 240.
EXT_MD: In extension mode1 or 2(REG[12h] Bit[6:4] = 111b or 110b),
LD_WIDTH: Driver data width. If LCD driver data bus is 4-bits then
Key-Scan Enable Bit
1 : Enable.
0 : Disable.
Key-Scan Matrix Selection
1 : 4x8 Matrix(KOUT[3:0] is used, KOUT[7:4] please keep floating)
0 : 8x8 Matrix(KOUT[7:0] is used)
Key-Scan Data Sampling Times
De-bounce times of scan frequency.
0 0 : 4
0 1 : 8
1 0 : 16
1 1 : 32
LNGKEY_EN : Long Time Key Function Enable
LNGKEY_EN = 0
LNGKEY_EN = 1
COM_PRD = ( COM_SCAN + ITCR) x XCK_PRD
COM_SCAN = (SEG_NO/LD_WIDTH) x (1 + EXT_MD)
XCK_PRD = 1 / XCK
the EXT_MD = 1, otherwise EXT_MD = 0.
clock(CLK) and REG[01h] Bit[3:2]. If system clock is
8MHz, REG[01h] Bit[3:2] = 10b, then XCK_PRD = 250ns.
LD_WIDTH = 4. If LCD driver data bus is 8-bits then
LD_WIDTH = 8. Please refer pin “DW” description of
Section 4-3.
Long key function is disable.
Long key function is enable.
Description
Description
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Two Layers Character/Graphic LCD Controller
www.raio.com.tw
Default
Default
00h
00
0
0
0
RA8806
Access
Access
R/W
R/W
R/W
R/W
R/W