RAiO RA8806 - Display Future

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Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller REG [F1h] Font Size Control Register (FVHT) Bit Description Default Access 7-6 Set Character Horizontal Size 0 0 : One Time of normal font width. 0 1 : Two Times of normal font width. 00 R/W 1 0 : Three Times of normal font width. 1 1 : Four Times of normal font width. 5-4 Set Character Vertical Size 0 0 : One Time of normal font height. 0 1 : Two Times of normal font height. 00 R/W 1 0 : Three Times of normal font height. 1 1 : Four Times of normal font height. 3-0 Reserved 0000 R RAiO TECHNOLOGY INC. 26/193 www.raio.com.tw
Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller 6. Function Description 6-1 MPU Interface 6-1-1 MPU Type The RA8806 support 8080 or 6800 compatible MPU interface. When the pin “MI” is pull low then the MPU interface is set to 8080 compatible. If “MI” pulls high then the MPU interface is defined as 6800 compatible. And the pin “DB” is used to select the 8080 MPU data bus is 4-bits or 8-bits. When “DB” is pulled low, then the data bus for data transition is 4-bits. If pin “DB” pull high, the data transition is 8-bits. The option of 4-bits or 8-bits data bus is for both 8080 and 6800 MPU. Of course, if used 4- bits interface then the 8080 MPU has to take double time to communicate with RA8806. In order to reduce the transmission line interference between MPU interface and RA8806, we suggest that a small capacitor to the GND should be added at the signal of ZCS1、ZRD、ZWR, please see the following Figure 6-1. 8080 MPU RA8806 A0 RS A1-A7 IORQ Decoder ZCS1 CS2 MI D0-D3(D0 -D7) RD WR RES DATA0-3(DATA0-7) ZRD ZWR ZRST Figure 6-1 : 8080 (4/8-bits) MPU Interface 6800 MPU RA8806 VDD A0 RS A1-A7 VMA Decoder ZCS1 CS2 MI D0-3(D0-D7) EN R/W RES DATA0-3(DATA0-7) EN ZRW ZRST Figure 6-2 : 6800 (4/8-bits) MPU Interface RAiO TECHNOLOGY INC. 27/193 www.raio.com.tw
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