参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 50/143页
文件大小: 0K
描述: KIT STARTER W/SPARTAN-3A
产品培训模块: FPGAs Spartan3
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3A
类型: FPGA
适用于相关产品: Spartan?3A FPGA,XC3S700A-FG484
所含物品: 板,线缆,文档,电源
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其它名称: 122-1514
Chapter 5: Character LCD Screen
R
The CG RAM address counter either remains constant after read or write operations, or
auto-increments or auto-decrements by one location, as defined by the I/D set by the Entry
Mode Set command.
Figure 5-5 provides an example that creates a special checkerboard character. The custom
character is stored in the fourth CG RAM character location, which is displayed when a
DD RAM location is 0x03. To write the custom character, the CG RAM address is first
initialized using the Set CG RAM Address command. The upper three address bits point to
the custom character location. The lower three address bits point to the row address for the
character bitmap. The Write Data to CG RAM or DD RAM command is used to write each
character bitmap row. A ‘1’ lights a bit on the display. A ‘0’ leaves the bit unlit. Only the
lower five data bits are used; the upper three data bits are don’t care positions. The eighth
row of bitmap data is usually left as all zeros to accommodate the cursor.
Upper Nibble
Lower Nibble
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
Character Address
Row Address
Don’t Care
Character Bitmap
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
0
Figure 5-5:
Example Custom Checkerboard Character with Character Code 0x03
Command Set
Table 5-2 summarizes the available LCD controller commands and bit definitions. Because
the display is set up for four-bit operation, each eight-bit command is sent as two four-bit
nibbles. The upper nibble is transferred first, followed by the lower nibble.
Table 5-2:
LCD Character Display Command Set (4-bit mode)
Function
Upper Nibble
Lower Nibble
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
S/C
0
0
1
D
R/L
0
1
I/D
C
-
1
-
S
B
-
50
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
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