RAiO RA8806 - Display Future

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Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller 6-5 Key-Scan 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]”. RA8806 KIN0 KIN1 KIN2 KIN3 KIN4 KIN5 KIN6 KIN7 KOUT0 KOUT1 KOUT2 KOUT3 KOUT4 KOUT5 KOUT6 KOUT7 Figure 6-22 : 8x8 Key-Pad Application The related Registers of Key-san function are KSCR, KSDR, and KSER. The RA8806 Key-Scan controller features are given below: 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 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. Table 6-14 : Key Number Mapping Table (Normal Key) ROW # 0 1 2 3 4 5 6 7 0 00h 01h 02h 03h 04h 05h 06h 07h 1 10h 11h 12h 13h 14h 15h 16h 17h 2 20h 21h 22h 23h 24h 25h 26h 27h COL # 3 4 30h 40h 31h 41h 32h 42h 33h 43h 34h 44h 35h 45h 36h 46h 37h 47h 5 50h 51h 52h 53h 54h 55h 56h 57h 6 60h 61h 62h 63h 64h 65h 66h 67h 7 70h 71h 72h 73h 74h 75h 76h 77h RAiO TECHNOLOGY INC. 52/193 www.raio.com.tw
Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller Table 6-15 : Key Number Mapping Table (Long Key) ROW # 0 1 2 3 4 5 6 7 0 80h 81h 82h 83h 84h 85h 86h 87h 1 90h 91h 92h 93h 94h 95h 96h 97h 2 A0h A1h A2h A3h A4h A5h A6h A7h COL # 3 4 5 B0h B1h B2h B3h B4h B5h B6h B7h C0h C1h C2h C3h C4h C5h C6h C7h D0h D1h D2h D3h D4h D5h D6h D7h 6 E0h E1h E2h E3h E4h E5h E6h E7h 7 F0h F1h F2h F3h F4h F5h F6h F7h When the Multi-Key function is applied, the pressed keys will be saved in the system each with KSDR0, KSDR1 and KSDR2. Note that the priority of keys saving is determined on the value size of Key-code, not the orders of keys pressing, please refer to the following example: Press the Key-code in turn of 0x44, 0x00 and 0x22, press Multi-Key at the same time, the Key-code will be saved in KSDR: KSDR0 = 0x00 KSDR1 = 0x22 KSDR2 = 0x44 The definition of Key-code is described in the registers KSDR0 ~ 2 [A2h ~ A4h]. The basic features of above Key-Scan settings are introduced as follows: Table 6-16 Reg. Bit_Num Description Reference Bit 7 Key-Scan enable bit Bit 6 Key-Scan size selection KSCR1 Bit [5:4] Key-Scan sampling times setting REG[A0h] Bit 3 Long key function enable Bit [2:0] Key-Scan scan frequency setting KSCR2 Bit [3:2] Bit [1:0] long key timing adjustment Pressed key number REG[A1h] KSDR0 KSDR1 KSDR2 Bit [7:0] Key code for pressed key REG[A2h ~ A4h] INTR Bit 5 Bit 1 Key-Scan interrupt enable Key-Scan Interrupt Status bit REG[0Fh] RAiO TECHNOLOGY INC. 53/193 www.raio.com.tw
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