ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 52

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

Preliminary Version 1.2
RAiO
6-5
TECHNOLOGY INC.
RA8806 features with Key-Scan circuit, and could be used as Keyboard function. It will help to integrate
the system circuit that includes keyboard application. The below Figure 6-22 shows the basic application
circuit of 8x8 Key-Pad. RA8806 already built-in pull-up resistors in the pins “KIN[7:0]”.
The related Registers of Key-san function are KSCR, KSDR, and KSER. The RA8806 Key-Scan
controller features are given below:
Table 6-14 is the key code of mapping to key-pad matrix for normal press. The key code will be stored in
REG[A2h] when key was pressed. If it was a long time press, then the key code is show as Table 6-15.
Key-Scan
1. Support with 4x8 or 8x8 Key-Scan Matrix
2. Programmable setting of sampling times and scan frequency of Key-Scan
3. Adjustable long key-press Timing
4. Multi-Key is available ( maximum three keys at the same time)
5. Allows the function of “ Key press to wake-up the system”
Table 6-14 : Key Number Mapping Table (Normal Key)
COL #
Figure 6-22 : 8x8 Key-Pad Application
0
1
2
3
4
5
6
7
RA8806
00h
10h
20h
30h
40h
50h
60h
70h
0
KOUT0
KOUT1
KOUT2
KOUT3
KOUT4
KOUT5
KOUT6
KOUT7
01h
11h
21h
31h
41h
51h
61h
71h
KIN0
KIN1
KIN2
KIN3
KIN4
KIN5
KIN6
KIN7
1
02h
12h
22h
32h
42h
52h
62h
72h
52/184
2
03h
13h
23h
33h
43h
53h
63h
73h
ROW #
3
Two Layers Character/Graphic LCD Controller
04h
14h
24h
34h
44h
54h
64h
74h
4
05h
15h
25h
35h
45h
55h
65h
75h
5
06h
16h
26h
36h
46h
56h
66h
76h
6
07h
17h
27h
37h
47h
57h
67h
77h
7
www.raio.com.tw
RA8806