參數(shù)資料
型號: LC74788N
文件頁數(shù): 49/50頁
文件大?。?/td> 175K
代理商: LC74788N
No. 7191-49/50
LC74735W
External ROM (2048 characters)
(1) Conditions
Use a 16-bit 4M ROM with an access time less than 3 times the dot clock period
Example: DCLK = 50 MHz = 20 ns period
×
3 = under 60 ns
DCLK = 10 MHz = 100 ns period
×
3 = under 300 ns
(2) ROM map
[1]
A1 to A0
00
12 bits
A6 to A2
QVGA mode
18 bits
WVGA mode
16 bits
D15 to D12, D11 to D0
Unused Used
01
10
11
Address
A17 to A7 (10 bits) = 2048 characters = character codes
Data
[2]
[3]
[4]
(3) Display appearance
1. QVGA: 1 character = 12
×
18 dots
Character font: [1]
Graphics: [1] + [2] + [3] + [4]
2. WVGA: 1 character = 12
×
16 dots
Character font: [1] [2]
[3] [4]
Graphics: ([1] + [2] + [3] + [4]) displayed magnified 2
×
in both the horizontal and vertical directions.
[1]
[2]
12
12
[3]
16
16
[4]
[1]+[2]
+[3]+[4]
×
2
12
12
16
16
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