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7220 Datasheet(PDF) 159 Page - Renesas Technology Corp

Part # 7220
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  303 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7220 Datasheet(HTML) 159 Page - Renesas Technology Corp

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M37220M3-XXXSP/FP
4.5 Functional description
4-21
7220 Group User’s Manual
(1)
Memory for display
There are 2 types of display memory: CRT display ROM (addresses 1000016 to 10FFF16) and CRT
display RAM (addresses 060016 to 06B316). Each type of display memory is described below.
s CRT display ROM (addresses 1000016 to 10FFF16)
CRT display ROM has a capacity of 4 K bytes. Since 32 bytes are required for 1 character data,
the ROM can stores up to 128 kinds of characters.
CRT display ROM is broadly divided into 2 areas. The [vertical 16 dots] ! [horizontal (left side)
8 dots] data of display characters are stored in addresses 1000016 to 107FF16 ; the [vertical 16
dots] ! [horizontal (right side) 4 dots] data of display characters are stored in addresses 1080016
to 10FFF16 (refer to “Figure 4.5.11”). Note however that the high-order 4 bits of the data to be
written to addresses 1080016 to 10FFF16 must be set to “1” (by writing data FX16).
Fig. 4.5.11 Example of display character data storing form
10XX016
+80016
0
0
00
00
0
0
0
00
00
0
0
0
00
01
0
0
0
00
10
1
0
0
01
00
0
0
0
01
00
0
0
0
01
00
0
0
0
10
00
0
0
1
01
11
11
00
1
0
1
00
00
0
0
1
00
00
0
0
1
00
00
0
0
0
00
00
0
0
0
00
10
1
0
0
00
01
0
0
1
1
11
00
0
0
00
0
0
00
0
0
00
0
0
00
0
0
00
0
0
00
0
0
10
0
0
10
0
0
10
0
0
01
0
0
01
0
0
01
0
0
00
0
0
00
0
0
00
0
10XXF16
+80016
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
11
1
1
b7
b0
b7
b0
b3
10XX016
10XXF16
0
00
00
0
0
0
0
0
1
1
1
0
0
0
0
0
0



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